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Journal articles on the topic 'Qubit stability'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Benenti, G., G. Casati, and S. Montangero. "Stability of Quantum Computing in the Presence of Imperfections." International Journal of Modern Physics B 17, no. 22n24 (2003): 3932–46. http://dx.doi.org/10.1142/s0217979203021927.

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We model an isolated quantum computer as a two-dimensional lattice of qubits (spin halves) with fluctuations in individual qubit energies and residual short-range inter-qubit couplings. We show that above a critical inter-qubit coupling strength, quantum chaos sets in and this results in the interaction induced dynamical thermalization and occupation numbers well described by the Fermi–Dirac distribution. This thermalization destroys the noninteracting qubit structure and sets serious requirements for the quantum computer operability. We then construct a quantum algorithm which uses qubits in

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Reichardt, B. W. "Quantum universality by state distillation." Quantum Information and Computation 9, no. 11&12 (2009): 1030–52. http://dx.doi.org/10.26421/qic9.11-12-7.

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Quantum universality can be achieved using classically controlled stabilizer operations and repeated preparation of certain ancilla states. Which ancilla states suffice for universality? This ``magic states distillation" question is closely related to quantum fault tolerance. Lower bounds on the noise tolerable on the ancilla help give lower bounds on the tolerable noise rate threshold for fault-tolerant computation. Upper bounds show the limits of threshold upper-bound arguments based on the Gottesman-Knill theorem. We extend the range of single-qubit mixed states that are known to give unive

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3

Yao, Yuchong. "Qubit: The Leap into Quantum Computation." Theoretical and Natural Science 51, no. 1 (2024): 43–50. http://dx.doi.org/10.54254/2753-8818/51/2024ch0159.

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Abstract. This article delves into the fundamental aspects of qubits in quantum computation, emphasizing their coordination, mathematical representation through the Bloch Sphere, and the unique advantages and challenges of superconducting, trapped ion, and photonic qubits. It highlights the transformative potential of quantum algorithms in solving complex problems in cryptography and information security, while addressing key sources of quantum errors such as decoherence and quantum noise. The study discusses advanced error correction methods and underscores the necessity of improving qubit co

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Researcher. "DESIGN AND IMPLEMENTATION OF FAULT-TOLERANT ARCHITECTURES IN SUPERCONDUCTING QUBIT SYSTEMS FOR LONG-TERM QUANTUM STABILITY." DESIGN AND IMPLEMENTATION OF FAULT-TOLERANT ARCHITECTURES IN SUPERCONDUCTING QUBIT SYSTEMS FOR LONG-TERM QUANTUM STABILITY 3, no. 1 (2025): 1–7. https://doi.org/10.5281/zenodo.14738021.

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Superconducting qubits are a cornerstone of quantum computing due to their high coherence times and scalability. However, quantum systems are inherently fragile and susceptible to decoherence, errors, and noise. This paper explores the design and implementation of fault-tolerant architectures in superconducting qubit systems to achieve long-term quantum stability. We provide an in-depth review of existing literature, analyze fault-tolerance techniques, and propose enhancements for practical quantum error correction. Graphical and tabular insights highlight the comparative performance of variou

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Mohamed, A.-B. A., H. A. Hessian, F. S. Al-Duais, and H. Eleuch. "Quantum coherence induced by a flux qubit coupled by a resonator coherent field through a two-photon interaction." Physica Scripta 96, no. 12 (2021): 125120. http://dx.doi.org/10.1088/1402-4896/ac3fd0.

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Abstract The intrinsic decoherence effects on a flux qubit coupled to a resonator through a two-photon interaction where the resonator field is initially in coherent and even coherent states are investigated. The qubit-resonator entanglement and coherence loss (mixedness) of the system and its subsystems are examined using entropy and negativity. The ability of the qubit-resonator interaction to generate quantum coherence (qubit-resonator entanglement and mixedness) is shown to be dependent on the initial cavity non-classicality, detuning, and decoherence. For larger values of the qubit-resona

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Golkar, S., and M. K. Tavassoly. "Atomic motion and dipole–dipole effects on the stability of atom–atom entanglement in Markovian/non-Markovian reservoir." Modern Physics Letters A 34, no. 10 (2019): 1950077. http://dx.doi.org/10.1142/s0217732319500779.

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In this paper, we consider the entanglement dynamics of two identical qubits (two-level atoms) accompanied by dipole–dipole interaction within a common reservoir in the strong and weak coupling regimes. We suppose that the qubits move in the reservoir which is at zero temperature. Using the time-dependent Schrödinger equation, the state vector of the qubits-reservoir system is obtained by which we can evaluate the concurrence as a suitable measure of entanglement between the two qubits. The results show that by choosing special initial conditions for the qubits, a different dynamical behavior

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Alicki, R., M. Horodecki, P. Horodecki, and R. Horodecki. "On Thermal Stability of Topological Qubit in Kitaev's 4D Model." Open Systems & Information Dynamics 17, no. 01 (2010): 1–20. http://dx.doi.org/10.1142/s1230161210000023.

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We analyse stability of the four-dimensional Kitaev model — a candidate for scalable quantum memory — in finite temperature within the weak coupling Markovian limit. It is shown that, below a critical temperature, certain topological qubit observables X and Z possess relaxation times exponentially long in the size of the system. Their construction involves polynomial in system size algorithm which uses as an input the results of measurements performed on all individual spins. We also discuss the drawbacks of such candidate for quantum memory and mention the implications of the stability of qub

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Muñoz, Carlos, Luis Roa, and Andrei B. Klimov. "Stability of Bi-Partite Correlations in Symmetric N-Qubit States Under Deterministic Measurements." Physics 7, no. 2 (2025): 12. https://doi.org/10.3390/physics7020012.

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In this paper, we analyze the distribution of bi-partite correlations in pure symmetric N-qubit states during local deterministic measurements, which ensure the same value of the reduced purities in the outcome states. It is analytically shown that all reduced purities grow in the process of deterministic measurements. This allows us to characterize the stability of bi-partite entanglement during the optimal correlation transfer under single-qubit measurements in the asymptotic limit N≫1.

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9

Mohamed, Abdel-Baset A., and Hichem Eleuch. "Entanglement Dynamics Induced by a Squeezed Coherent Cavity Coupled Nonlinearly with a Qubit and Filled with a Kerr-Like Medium." Entropy 23, no. 5 (2021): 496. http://dx.doi.org/10.3390/e23050496.

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An analytical solution for a master equation describing the dynamics of a qubit interacting with a nonlinear Kerr-like cavity through intensity-dependent coupling is established. A superposition of squeezed coherent states is propped as the initial cavity field. The dynamics of the entangled qubit-cavity states are explored by negativity for different deformed function of the intensity-dependent coupling. We have examined the effects of the Kerr-like nonlinearity and the qubit-cavity detuning as well as the phase cavity damping on the generated entanglement. The intensity-dependent coupling in

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10

Enríquez, Marco, Alfonso Jaimes-Nájera, and Francisco Delgado. "Single-Qubit Driving Fields and Mathieu Functions." Symmetry 11, no. 9 (2019): 1172. http://dx.doi.org/10.3390/sym11091172.

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We report a new family of time-dependent single-qubit radiation fields for which the correspondent evolution operator can be disentangled in an exact way via the Wei–Norman formalism. Such fields are characterized in terms of the Mathieu functions. We show that the regions of stability of the Mathieu functions determine the nature of the driving fields: For parameters in the stable region, the fields are oscillating, being able to be periodic under certain conditions. Whereas, for parameters in the instability region, the fields are pulse-like. In addition, in the stability region, this family

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11

Tajimuratovich, Kalmuratov Maksetbay. "Influence Of Quantum Calculations On The Industry Of Information Technologies." American Journal of Engineering and Technology 7, no. 6 (2025): 124–26. https://doi.org/10.37547/tajet/volume07issue06-13.

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Quantum calculations, based on the principles of quantum mechanics, can significantly change the information technology industry. Unlike classical computers, quantum computers use qubits that can be superposed, which allows them to significantly accelerate the solution of complex tasks such as optimization, big data processing, and cryptography. The article examines the impact of quantum computing on information processing, data security, and artificial intelligence, as well as the challenges facing the industry, including the problems of qubit stability and the need for retraining specialists

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12

Hu, Rui-Zi, Rong-Long Ma, Ming Ni, et al. "An Operation Guide of Si-MOS Quantum Dots for Spin Qubits." Nanomaterials 11, no. 10 (2021): 2486. http://dx.doi.org/10.3390/nano11102486.

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In the last 20 years, silicon quantum dots have received considerable attention from academic and industrial communities for research on readout, manipulation, storage, near-neighbor and long-range coupling of spin qubits. In this paper, we introduce how to realize a single spin qubit from Si-MOS quantum dots. First, we introduce the structure of a typical Si-MOS quantum dot and the experimental setup. Then, we show the basic properties of the quantum dot, including charge stability diagram, orbital state, valley state, lever arm, electron temperature, tunneling rate and spin lifetime. After t

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Tsukanov, A. V., and I. Yu Kateev. "Recording the Polarization State of a Photon in the Correlated Electronic States of an Array of Quantum Dots." Микроэлектроника 52, no. 3 (2023): 183–99. http://dx.doi.org/10.31857/s054412692370028x.

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A scheme is proposed for converting a transport photonic qubit into a stationary qubit represented by the electronic states of quantum dots (QDs). The choice of the basis states of a qubit in the form of anti-symmetric combinations of the excited states of an array of QDs ensures their stability with respect to pho-ton/phonon relaxation processes. The formation of these states is due to the Stark and Förster interactions between electrons localized in the QDs. An algorithm for the controlled transformation (recording) of a pho-ton state into the electronic states of QDs using optical and elect

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Sripakdee, Chatchawal, and Napatasakon Sarapat. "Novel Optical Trapping Micro-Sensor from PANDA Ring Resonator for Quantum Computer Processing." Applied Mechanics and Materials 804 (October 2015): 311–15. http://dx.doi.org/10.4028/www.scientific.net/amm.804.311.

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We firstly present and analyze a feasible schematic optical sensor made from PANDA ring resonator which generates WGM of tunneling photons to be used in the atomic trapping process in quantum computer processing to teleport quantum states. A simulation done by launching electromagnetics of Gaussian soliton pulses into an optical tweezers device is given to obtain time dependent evolution of polarization qubit states. It shows that under very low temperature, an optimum photon resonant frequency of such qubit has sufficient stability lifetime to be used in quantum signal states transferring pur

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15

Basem R. Kazem and Mezher B. Saleh. "The linear Paul Trap's Confined Stability Area for 40Ca+ Ions." Journal of the College of Basic Education 30, no. 123 (2024): 57–72. http://dx.doi.org/10.35950/cbej.v30i123.11336.

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Quantum technology offers new computational, communication, simulation, and metrology methods. Traditional computers need help to solve significant problems like factorization due to exponential increases in computation time. However, quantum computers utilize quantum mechanics for sub-exponential problem size and can simulate nature at the quantum level. Scientists are increasingly interested in developing quantum computers using single ionized atoms in Paul traps. Each ion's ground state represents the least possible qubit value. The 40Ca+ trapped ions were used in a study as an example of a

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Lyakhno, V. Yu, O. G. Turutanov, A. P. Boichenko, A. P. Shapovalov, A. A. Kalenyuk, and V. I. Shnyrkov. "Hybrid shield for microwave single-photon counter based on a flux qubit." Low Temperature Physics 48, no. 3 (2022): 228–31. http://dx.doi.org/10.1063/10.0009541.

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A scenario of shielding and stabilization of magnetic and electromagnetic fields in the measuring volume occupied by a superconducting flux qubit is considered. The qubit is used as an artificial macroscopic atom with discrete energy levels in a counter of single photons of the microwave range. It is shown that a decrease in the amplitude of variations of the external magnetic field inside the 3-layer hybrid cylindrical shield, composed of superconducting and ferromagnetic cylinders with the diameter-to-length ratio of 1:5, provides high stability of the magnetic field. The absolute value of t

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Sellem, Lev-Arcady, Rémi Robin, Philippe Campagne-Ibarcq, and Pierre Rouchon. "Stability and decoherence rates of a GKP qubit protected by dissipation⋆." IFAC-PapersOnLine 56, no. 2 (2023): 1325–32. http://dx.doi.org/10.1016/j.ifacol.2023.10.1776.

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18

Reichmann, Felix, Alberto Mistroni, Yuji Yamamoto, et al. "(Invited) Advancing Si Spin Qubit Research: Process Integration of Hall Bar FETs on Si/SiGe in a 200mm BiCMOS Pilot Line." ECS Meeting Abstracts MA2024-02, no. 32 (2024): 2319. https://doi.org/10.1149/ma2024-02322319mtgabs.

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A fault-tolerant universal quantum computer will require millions of physical qubits, necessitating a highly scalable qubit platform. Si-based spin qubits emerged as a leading candidate, boasting high fidelities, straightforward tunability, and compatibility with the CMOS fabrication process. The progress in this qubit platform in the last two years was remarkable: a 6-qubit quantum processor [1], qubits manufactured in a 300 mm foundry [2] and electron shuttling over long distances [3,4] have been demonstrated. The technological basis of Si spin qubits are electrostatically defined quantum do

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Gerasin, Ilya, Nikita Zhadnov, Konstantin Kudeyarov, Ksienia Khabarova, Nikolay Kolachevsky, and Ilya Semerikov. "Optimized Surface Ion Trap Design for Tight Confinement and Separation of Ion Chains." Quantum Reports 6, no. 3 (2024): 442–51. http://dx.doi.org/10.3390/quantum6030029.

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Qubit systems based on trapped ultracold ions win one of the leading positions in the quantum computing field, demonstrating quantum algorithms with the highest complexity to date. Surface Paul traps for ion confinement open the opportunity to scale quantum processors to hundreds of qubits and enable high-connectivity manipulations on ions. To fabricate such a system with certain characteristics, the special design of a surface electrode structure is required. The depth of the trapping potential, the stability parameter, the secular frequency and the distance between an ion and the trap surfac

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Baladari, Venkata. "Quantum Computing: Advancing the Horizons of Computational Capabilities." International Journal of Science and Research (IJSR) 13, no. 3 (2024): 1968–73. https://doi.org/10.21275/SR24031115135.

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Quantum computing is a rapidly developing technology that uses the principles of quantum mechanics to perform information processing tasks that are beyond the capabilities of traditional computers. Quantum computers employ qubits, superposition, and entanglement to rapidly resolve intricate problems, with potential applications in cryptography, artificial intelligence, the development of new medications, and financial modeling. Recent breakthroughs have shown potential, but hurdles like correcting errors, maintaining qubit stability, expanding and the expense of substantial infrastructure cont

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Mohan Harish Maturi, Snehal Satish, Karthik Meduri, and Geeta Sandeep Nadella. "Quantum Computing in 2020: A Systematic Review of Algorithms, Hardware Development, and Practical Applications." Universal Research Reports 7, no. 10 (2020): 140–54. http://dx.doi.org/10.36676/urr.v7.i10.1427.

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Quantum computing is the developing field at the intersection of computer science and physics with quantum mechanics principles to solve complex problems far outside the abilities of traditional computers. This systematic review analyzes key progress in quantum developments, hardware development, and practical applications in 2020. In terms of algorithms, significant progress was made in cross-quantum conventional methods such as the Variation-Quantum-Eigen solver (VQE) and Quantum-Approximate-Upgrading-Algorithms (QAOA) and alongside breakthroughs in quantum machine-learnings. The hardware fr

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Czischek, Stefanie, Victor Yon, Marc-Antoine Genest, et al. "Miniaturizing neural networks for charge state autotuning in quantum dots." Machine Learning: Science and Technology 3, no. 1 (2021): 015001. http://dx.doi.org/10.1088/2632-2153/ac34db.

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Abstract A key challenge in scaling quantum computers is the calibration and control of multiple qubits. In solid-state quantum dots (QDs), the gate voltages required to stabilize quantized charges are unique for each individual qubit, resulting in a high-dimensional control parameter space that must be tuned automatically. Machine learning techniques are capable of processing high-dimensional data—provided that an appropriate training set is available—and have been successfully used for autotuning in the past. In this paper, we develop extremely small feed-forward neural networks that can be

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SCHMID, CH, N. KIESEL, U. WEBER, R. URSIN, and H. WEINFURTER. "EXPERIMENTAL ANALYSIS OF A SIMPLE LINEAR OPTICS PHASE GATE." International Journal of Quantum Information 05, no. 01n02 (2007): 235–40. http://dx.doi.org/10.1142/s0219749907002682.

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Linear optics two-qubit logic gates are essential tools in photonic quantum information. We describe a recently introduced simple conditional phase gate for photons, which relies on only one second order interference at a polarization dependent beam splitter, thereby making additional stability precautions dispensable. The improved quality of the gate is evaluated by performing full process tomography. The obtained process tomography data is fitted by a model based on experimental parameters of the setup which allows predictions on the performance of the gate in multi-photon experiments. .

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Waheed, Zaman Khan, Haseeb Muhammad, Nawab Khan Shahzad, et al. "Quantum Materials: Key to Advancing Quantum Computing by Enhancing Stability, Scalability, and Error Resistance through Superconductors, Topological Insulators, and 2D Materials for Scalable Systems." Global Scientific and Academic Research Journal of Multidisciplinary Studies 4, no. 4 (2025): 01–30. https://doi.org/10.5281/zenodo.15180740.

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<em>Quantum computing is poised to transform computational power by surpassing the limitations of traditional systems. Central to this evolution are quantum materials, which possess properties grounded in quantum mechanics and are essential for developing scalable, fault-tolerant quantum systems. This paper examines the pivotal role of quantum materials, including superconductors, topological insulators, two-dimensional (2D) materials, and spintronics, in the field. The first section examines the limitations of silicon in quantum applications, particularly in addressing quantum effects such as

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Wei, Wenzhe, Peng Hao, Zhiyu Ma, et al. "Measurement and suppression of magnetic field noise of trapped ion qubit." Journal of Physics B: Atomic, Molecular and Optical Physics 55, no. 7 (2022): 075001. http://dx.doi.org/10.1088/1361-6455/ac5e7d.

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Abstract Magnetic field noise is an important factor causing quantum decoherence in quantum systems. In order to suppress the decoherence effect, magnetic field noise needs to be properly measured and controlled. Magnetic field noise power spectrum measurement using a single trapped ion based quantum spectrum analyzer is a very effective way. In this paper, the magnetic field noise measurement based on dynamic decoupling technique is analyzed theoretically. Furthermore, we use magnetically insensitive transition to measure the magnetic field noise, which has the potential to measure stronger m

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Mittal, Meera. "Quantum Computing and Information: Recent Developments and Future Prospects." Journal of Quantum Science and Technology 1, no. 2 (2024): 12–17. http://dx.doi.org/10.36676/jqst.v1.i2.10.

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Recent advancements in quantum computing have sparked significant interest due to their potential to revolutionize various fields, from cryptography to optimization problems. This paper reviews recent developments in quantum computing and quantum information theory, focusing on breakthroughs in qubit stability, error correction codes, and quantum algorithm design. Key achievements include the demonstration of quantum supremacy in specific tasks and progress towards scalable quantum processors. Looking forward, the prospects of quantum computing in solving complex computational problems and its

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One, Roxana-Alina, Sever Mican, Angela-Georgiana Cimpoeșu, Marius Joldos, Romulus Tetean, and Coriolan Viorel Tiușan. "Micromagnetic Design of Skyrmionic Materials and Chiral Magnetic Configurations in Patterned Nanostructures for Neuromorphic and Qubit Applications." Nanomaterials 12, no. 24 (2022): 4411. http://dx.doi.org/10.3390/nano12244411.

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Our study addresses the problematics of magnetic skyrmions, nanometer-size vortex-like swirling topological defects, broadly studied today for applications in classic, neuromorphic and quantum information technologies. We tackle some challenging issues of material properties versus skyrmion stability and manipulation within a multiple-scale modeling framework, involving complementary ab-initio and micromagnetic frameworks. Ab-initio calculations provide insight into the anatomy of the magnetic anisotropy, the Dzyaloshinskii–Moriya asymmetric exchange interaction (DMI) and their response to a g

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Surendar Aravindhan. "Quantum Computing in Electronics: A New Era of Ultra-Fast Processing." Communications on Applied Nonlinear Analysis 32, no. 3 (2024): 372–82. http://dx.doi.org/10.52783/cana.v32.1994.

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Quantum computing has been predicted to radically change the electronics industry, especially by implementing ultra-fast processing. Different from other types of computers, quantum computers use qubits instead of binary bits since they can be in multiple states at once because of superposition and entanglement. This creates the ability to perform various calculations simultaneously thus introducing exponential increases in the processing capability hence the efficiency of quantum computers. The applicability of the findings to electronics is extensive since it can be applied in cryptography,

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Harraz, Sajede, and Shuang Cong. "State Transfer via On-Line State Estimation and Lyapunov-Based Feedback Control for a N-Qubit System." Entropy 21, no. 8 (2019): 751. http://dx.doi.org/10.3390/e21080751.

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In this paper, we propose a Lyapunov-based state feedback control for state transfer based on the on-line quantum state estimation (OQSE). The OQSE is designed based on continuous weak measurements and compressed sensing. The controlled system is described by quantum master equation for open quantum systems, and the continuous measurement operators are derived according to the dynamic equation of system. The feedback control law is designed based on the Lyapunov stability theorem, and a strict proof of proposed control laws are given. At each sampling time, the state is estimated on-line, whic

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Filippova, Asya V., Maria V. Ryabukhina, Georgy N. Odinokov, and Natalya G. Karpova. "Comparative analysis of the efficiency of methods for DNA extraction from animal tissues." Bulletin of Nizhnevartovsk State University, no. 2 (June 21, 2024): 76–85. http://dx.doi.org/10.36906/2311-4444/24-2/07.

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For the first time, a comparative analysis of the effectiveness of DNA extraction methods used in expert forensic practice from various animal tissues – bone antlers and hooves of reindeer Rangifer tarandus (Linnaeus, 1758); skeletal muscle, cartilage tissue and mucus of rainbow trout Oncorhynchus mykkis (Walbaum, 1792); skeletal muscles and ribs of the domestic pig Sus scrofa domesticus (Erxleben, 1777). DNA extraction was carried out according to the manufacturers' protocols using six commercial reagent kits, domestically produced, based on the alcohol precipitation method: "GM Tissue" (Rais

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Solntsev, A. S., F. Setzpfandt, A. S. Clark, et al. "Quantum Walks of Photons on a Nonlinear Chip." Asia Pacific Physics Newsletter 04, no. 01 (2015): 56. http://dx.doi.org/10.1142/s2251158x1500020x.

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Quantum entanglement underpins the realization of quantum simulators and computers, which can be used for unbreakable cryptography and powerful computational algorithms. Entangled photons are an ideal medium for creating and manipulating quantum states due to the low noise and ease of transmission. A qubit encoded into a photon can be easily sent between different photonic elements along an optical fiber, in analogy with the transmission of classical bits along electrical wires. Furthermore, logic operations can be performed on entangled photons by exploiting the nonlinearity inherent to quant

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Vallury, Harish J., Michael A. Jones, Charles D. Hill, and Lloyd C. L. Hollenberg. "Quantum computed moments correction to variational estimates." Quantum 4 (December 15, 2020): 373. http://dx.doi.org/10.22331/q-2020-12-15-373.

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The variational principle of quantum mechanics is the backbone of hybrid quantum computing for a range of applications. However, as the problem size grows, quantum logic errors and the effect of barren plateaus overwhelm the quality of the results. There is now a clear focus on strategies that require fewer quantum circuit steps and are robust to device errors. Here we present an approach in which problem complexity is transferred to dynamic quantities computed on the quantum processor – Hamiltonian moments, ⟨Hn⟩. From these quantum computed moments, an estimate of the ground-state energy can

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Pastawski, F., A. Kay, N. Schuch, and I. Cirac. "Limitations of passive protection of quantum information." Quantum Information and Computation 10, no. 7&8 (2010): 580–618. http://dx.doi.org/10.26421/qic10.7-8-3.

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The ability to protect quantum information from the effect of noise is one of the major goals of quantum information processing. In this article, we study limitations on the asymptotic stability of quantum information stored in passive $N$-qubit systems. We consider the effect of small imperfections in the implementation of the protecting Hamiltonian in the form of perturbations or weak coupling to a ground state environment. We thus depart from the usual Markovian approximation for a thermal bath by conce ntrating on models for which part of the evolution can be calculated exactly. We prove t

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Münch, Carolin, Saikal Shamkeeva, Mitja Heinemann, et al. "Abstract 6693: Stability of urinary cell-free DNA and detection of T790M variant." Cancer Research 83, no. 7_Supplement (2023): 6693. http://dx.doi.org/10.1158/1538-7445.am2023-6693.

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Abstract Background: The so-called “liquid biopsy” has become a powerful tool for cancer research in the recent years, with circulating cell-free DNA (cfDNA) that originates from tumors as one of the most promising analytes. In contrast to plasma derived cfDNA, only a few studies were performed investigating urinary cfDNA. One reason might be quick degradation and hence relatively low concentrations of urinary cfDNA. This study focused on examining the stability of cfDNA in urine using different ways of preservation under various storage conditions. Methodology: To mimic patient samples, a poo

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Goel, Pallavi, Neha Kumari, Inderjeet Kaur, et al. "EXTH-38. EVALUATION OF STORAGE CONDITIONS ON SERUM-DERIVED EXTRACELLULAR VESICLES IN BRAIN TUMOR SAMPLES." Neuro-Oncology 26, Supplement_8 (2024): viii245. http://dx.doi.org/10.1093/neuonc/noae165.0969.

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Abstract Tumor-derived Extracellular Vesicles (EVs) are emerging as potential liquid biopsy tool in the field of cancer diagnosis and therapeutic targets. The functionality of EVs depends on its diverse cargo, which is known to alter host-receipient cells. Nevertheless, extracting EVs while preserving its integrity and functionality of its contents is challenging, specifically in Low-middle Income countries (LMIC) countries. Our study focussed on extraction of serum derived EVs analysis from brain-tumor samples encompassing Oligodendrogliomas, Astrocytomas and Glioblastomas. The stability of E

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Sogabe, Tomah, Tomoaki Kimura, Chih-Chieh Chen, et al. "Model-Free Deep Recurrent Q-Network Reinforcement Learning for Quantum Circuit Architectures Design." Quantum Reports 4, no. 4 (2022): 380–89. http://dx.doi.org/10.3390/quantum4040027.

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Artificial intelligence (AI) technology leads to new insights into the manipulation of quantum systems in the Noisy Intermediate-Scale Quantum (NISQ) era. Classical agent-based artificial intelligence algorithms provide a framework for the design or control of quantum systems. Traditional reinforcement learning methods are designed for the Markov Decision Process (MDP) and, hence, have difficulty in dealing with partially observable or quantum observable decision processes. Due to the difficulty of building or inferring a model of a specified quantum system, a model-free-based control approach

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Tolotti, Emiliano, Enrico Zardini, Enrico Blanzieri, and Davide Pastorello. "Ensembles of quantum classifiers." Quantum Information & Computation 24, no. 3&4 (2024): 181–209. http://dx.doi.org/10.26421/qic24.3-4-1.

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In the current era, known as Noisy Intermediate-Scale Quantum (NISQ), encoding large amounts of data in the quantum devices is challenging and the impact of noise significantly affects the quality of the obtained results. A viable approach for the execution of quantum classification algorithms is the introduction of a well-known machine learning paradigm, namely, the ensemble methods. Indeed, the ensembles combine multiple internal classifiers, which are characterized by compact sizes due to the smaller data subsets used for training, to achieve more accurate and robust prediction performance.

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Liu, Zhigang, Jin Shang, and Xufen Hua. "Smart City Moving Target Tracking Algorithm Based on Quantum Genetic and Particle Filter." Wireless Communications and Mobile Computing 2020 (June 20, 2020): 1–9. http://dx.doi.org/10.1155/2020/8865298.

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In the application of moving target tracking in smart city, particle filter technology has the advantages of dealing with nonlinear and non-Gaussian problems, but when the standard particle filter uses resampling method to solve the degradation phenomenon, simply copying the particles will cause local optimization difficulties, resulting in unstable filtering accuracy. In this paper, a particle filter algorithm combined with quantum genetic algorithm (QGA) is proposed to solve the above problems. Aiming at the problem of particle exhaustion in particle filter, the algorithm adopts the method o

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Nel, Ivonne, Carolin Münch, Saikal Shamkeeva, Mitja L. Heinemann, Berend Isermann, and Bahriye Aktas. "The Challenge to Stabilize, Extract and Analyze Urinary Cell-Free DNA (ucfDNA) during Clinical Routine." Diagnostics 13, no. 24 (2023): 3670. http://dx.doi.org/10.3390/diagnostics13243670.

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Background: The “Liquid Biopsy” has become a powerful tool for cancer research during the last decade. Circulating cell-free DNA (cfDNA) that originates from tumors has emerged as one of the most promising analytes. In contrast to plasma-derived cfDNA, only a few studies have investigated urinary cfDNA. One reason might be rapid degradation and hence inadequate concentrations for downstream analysis. In this study, we examined the stability of cfDNA in urine using different methods of preservation under various storage conditions. Methodology: To mimic patient samples, a pool of healthy male a

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Musavi, S. A. S., M. K. Tavassoly, and S. Salimian. "Entanglement dynamics and population inversion of a two-qubit system in two cavities coupled with optical fiber in the presence of two-photon transition." Modern Physics Letters A, May 12, 2023. http://dx.doi.org/10.1142/s0217732323500268.

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In this paper, the entanglement between two qubits that exist in two distinct cavities which are connected by an optical fiber is investigated by using the concurrence, while two-photon transitions and Kerr medium effect are also considered. Each cavity contains a qubit and a single-mode quantized field. The appearance of entanglement between the two qubits in the separate cavities originates from the presence of optical fiber. The obtained numerical results of the considered system show that, if the Kerr medium is large enough, the initial values of entanglement between the two qubits (which

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Agarwal, Abhishek, Lachlan P. Lindoy, Deep Lall, François Jamet, and Ivan Rungger. "Modelling non-Markovian noise in driven superconducting qubits." Quantum Science and Technology, April 11, 2024. http://dx.doi.org/10.1088/2058-9565/ad3d7e.

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Abstract Non-Markovian noise can be a significant source of errors in superconducting qubits. We develop gate sequences utilising mirrored pseudoidentities that allow us to characterise and model the effects of non-Markovian noise on both idle and driven qubits. We compare three approaches to modelling the observed noise: (i) a Markovian noise model, (ii) a model including interactions with a two-level system (TLS), (iii) a model utilising the post Markovian master equation (PMME), which we show to be equivalent to the qubit-TLS model in certain regimes. When running our noise characterisation

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Pan, Xianchuang, Yuxuan Zhou, Haolan Yuan, et al. "Engineering superconducting qubits to reduce quasiparticles and charge noise." Nature Communications 13, no. 1 (2022). http://dx.doi.org/10.1038/s41467-022-34727-2.

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AbstractIdentifying, quantifying, and suppressing decoherence mechanisms in qubits are important steps towards the goal of engineering a quantum computer or simulator. Superconducting circuits offer flexibility in qubit design; however, their performance is adversely affected by quasiparticles (broken Cooper pairs). Developing a quasiparticle mitigation strategy compatible with scalable, high-coherence devices is therefore highly desirable. Here we experimentally demonstrate how to control quasiparticle generation by downsizing the qubit, capping it with a metallic cover, and equipping it with

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Berritta, Fabrizio, Torbjørn Rasmussen, Jan A. Krzywda, et al. "Real-time two-axis control of a spin qubit." Nature Communications 15, no. 1 (2024). http://dx.doi.org/10.1038/s41467-024-45857-0.

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AbstractOptimal control of qubits requires the ability to adapt continuously to their ever-changing environment. We demonstrate a real-time control protocol for a two-electron singlet-triplet qubit with two fluctuating Hamiltonian parameters. Our approach leverages single-shot readout classification and dynamic waveform generation, allowing full Hamiltonian estimation to dynamically stabilize and optimize the qubit performance. Powered by a field-programmable gate array (FPGA), the quantum control electronics estimates the Overhauser field gradient between the two electrons in real time, enabl

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McEwen, M., D. Kafri, Z. Chen, et al. "Removing leakage-induced correlated errors in superconducting quantum error correction." Nature Communications 12, no. 1 (2021). http://dx.doi.org/10.1038/s41467-021-21982-y.

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AbstractQuantum computing can become scalable through error correction, but logical error rates only decrease with system size when physical errors are sufficiently uncorrelated. During computation, unused high energy levels of the qubits can become excited, creating leakage states that are long-lived and mobile. Particularly for superconducting transmon qubits, this leakage opens a path to errors that are correlated in space and time. Here, we report a reset protocol that returns a qubit to the ground state from all relevant higher level states. We test its performance with the bit-flip stabi

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Shulga, Kirill. "Dissipative Stability and Dynamical Phase Transition in Two Driven Interacting Qubits." Quantum Science and Technology, March 18, 2024. http://dx.doi.org/10.1088/2058-9565/ad34f6.

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Abstract We examine a two-qubit system influenced by a time-periodic external field while interacting with a Markovian bath. This scenario significantly impacts the temporal coherence characteristics of the system. By solving the evolution equation for the density matrix operator, we determine the characteristic equilibration time and analyze the concurrence parameter—a key metric for quantifying entanglement. Our findings reveal the system's ability to navigate through a dynamic phase transition. These results pave the way to designing systems of interacting qubits demonstrating robust entang

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Zubeldia, Martin, Prakirt R. Jhunjhunwala, and Siva Theja Maguluri. "Matching Queues with Abandonments in Quantum Switches: Stability and Throughput Analysis." Operations Research, March 4, 2025. https://doi.org/10.1287/opre.2023.0032.

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Researchers have developed a novel model inspired by quantum switches to address the complexities of matching requests for entangled qubits in a discrete-time system. The study examines two types of arrivals: requests for entangled qubits between nodes and qubits supplied by nodes, which are subject to decoherence over time. Unlike classical queueing models, this system features server-less multiway matching and correlated abandonments, posing unique analytical challenges. By applying a max-weight policy, the researchers characterized the system’s stability using a two-time-scale fluid limit t

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Huang, Jijun, Qiang Ke, and Xueling Lei. "First principles studies of defect centers in two-dimensional NaCl associated with spin qubits." Journal of Applied Physics 137, no. 13 (2025). https://doi.org/10.1063/5.0250329.

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Spin defects in solids offer promising quantum bits (qubits) for quantum applications. However, the precise control of defect centers in three-dimensional (3D) crystals remains challenging. In contrast, two-dimensional (2D) materials provide a superior platform for both the controlled creation and precise manipulation of defect qubits. This work employs first-principles calculations to demonstrate that 2D NaCl exhibits high stability, a wide bandgap, and negligible spin–orbit coupling, making it a potential candidate for qubit host material. Among the eleven designed defects in 2D NaCl, the Se

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Börner, Simon-Dominik, Christoph Berke, David P. DiVincenzo, Simon Trebst, and Alexander Altland. "Classical chaos in quantum computers." Physical Review Research 6, no. 3 (2024). http://dx.doi.org/10.1103/physrevresearch.6.033128.

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The development of quantum computing hardware is facing the challenge that current-day quantum processors, comprising 50–100 qubits, already operate outside the range of quantum simulation on classical computers. In this paper we demonstrate that the simulation of limits can be a potent diagnostic tool for the resilience of quantum information hardware against chaotic instabilities potentially mitigating this problem. As a testbed for our approach we consider the transmon qubit processor, a computing platform in which the coupling of large numbers of nonlinear quantum oscillators may trigger d

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Lu, Yong, Andreas Bengtsson, Jonathan J. Burnett, et al. "Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source." npj Quantum Information 7, no. 1 (2021). http://dx.doi.org/10.1038/s41534-021-00480-5.

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AbstractWe demonstrate an on-demand source of microwave single photons with 71–99% intrinsic quantum efficiency. The source is narrowband (300 kHz) and tuneable over a 600 MHz range around 5.2 GHz. Such a device is an important element in numerous quantum technologies and applications. The device consists of a superconducting transmon qubit coupled to the open end of a transmission line. A π-pulse excites the qubit, which subsequently rapidly emits a single photon into the transmission line. A cancellation pulse then suppresses the reflected π-pulse by 33.5 dB, resulting in 0.005 photons leaki

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Lee, Elizabeth M. Y., Alvin Yu, Juan J. de Pablo, and Giulia Galli. "Stability and molecular pathways to the formation of spin defects in silicon carbide." Nature Communications 12, no. 1 (2021). http://dx.doi.org/10.1038/s41467-021-26419-0.

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AbstractSpin defects in wide-bandgap semiconductors provide a promising platform to create qubits for quantum technologies. Their synthesis, however, presents considerable challenges, and the mechanisms responsible for their generation or annihilation are poorly understood. Here, we elucidate spin defect formation processes in a binary crystal for a key qubit candidate—the divacancy complex (VV) in silicon carbide (SiC). Using atomistic models, enhanced sampling simulations, and density functional theory calculations, we find that VV formation is a thermally activated process that competes wit

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