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Artículos de revistas sobre el tema "Quantum Optics, Quantum Superposition, Entanglement, Experimental Physics"

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Publicado: 10 de marzo de 2023

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1

Waitzmann, Moritz, Kim-Alessandro Weber, Susanne Wessnigk, and Ruediger Scholz. "Key Experiment and Quantum Reasoning." Physics 4, no. 4 (2022): 1202–29. http://dx.doi.org/10.3390/physics4040078.

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For around five decades, physicists have been experimenting with single quanta such as single photons. Insofar as the practised ensemble reasoning has become obsolete for the interpretation of these experiments, the non-classical intrinsic probabilistic nature of quantum theory has gained increased importance. One of the most important exclusive features of quantum physics is the undeniable existence of the superposition of states, even for single quantum objects. One known example of this effect is entanglement. In this paper, two classically contradictory phenomena are combined to one single
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2

Matsumura, Akira. "Role of matter coherence in entanglement due to gravity." Quantum 6 (October 11, 2022): 832. http://dx.doi.org/10.22331/q-2022-10-11-832.

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We investigate the quantum nature of gravity in terms of the coherence of quantum objects. As a basic setting, we consider two gravitating objects each in a superposition state of two paths. The evolution of objects is described by the completely positive and trace-preserving (CPTP) map with a population-preserving property. This property reflects that the probability of objects being on each path is preserved. We use the ℓ1-norm of coherence to quantify the coherence of objects. In the present paper, the quantum nature of gravity is characterized by an entangling map, which is a CP
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3

Gulbahar, Burhan. "Theory of Quantum Path Entanglement and Interference with Multiplane Diffraction of Classical Light Sources." Entropy 22, no. 2 (2020): 246. http://dx.doi.org/10.3390/e22020246.

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Quantum history states were recently formulated by extending the consistent histories approach of Griffiths to the entangled superposition of evolution paths and were then experimented with Greenberger–Horne–Zeilinger states. Tensor product structure of history-dependent correlations was also recently exploited as a quantum computing resource in simple linear optical setups performing multiplane diffraction (MPD) of fermionic and bosonic particles with remarkable promises. This significantly motivates the definition of quantum histories of MPD as entanglement resources with the inherent capabi
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4

Kalaga, Joanna K., Wiesław Leoński, and Radosław Szczęśniak. "Quantum steering in an asymmetric chain of nonlinear oscillators." Photonics Letters of Poland 9, no. 3 (2017): 97. http://dx.doi.org/10.4302/plp.v9i3.759.

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We discuss here a possibility of generation of steerable states in asymmetric chains comprising three Kerr-like nonlinear oscillators. We show that steering between modes can be generated in the system and it strongly depends on the asymmetry of internal couplings in our model. We can lead to the appearance of new steering effects, which were not present in symmetric models already studied in the literature. Full Text: PDF ReferencesE. Schrödinger, "Discussion of Probability Relations between Separated Systems", Math. Proc. Camb. Phil. Soc. 31, 555 (1935). CrossRef M.D. Reid, "Demonstration of
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5

Galvez, E. J. "A Curriculum of Table-Top Quantum Optics Experiments to Teach Quantum Physics." Journal of Physics: Conference Series 2448, no. 1 (2023): 012006. http://dx.doi.org/10.1088/1742-6596/2448/1/012006.

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Abstract The rise of quantum information as a viable technology requires appropriate instructional curricula for preparing a future workforce. Key concepts that are the basis of quantum information involve fundamentals of quantum mechanics, such as superposition, entanglement and measurement. To complement modern initiatives to teach quantum physics to the emerging workforce, lab experiences are needed. We have developed a curriculum of quantum optics experiments to teach quantum mechanics fundamentals and quantum algebra. These laboratories provide hands-on experimentation of optical componen
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6

Amin, Syed Tahir, and Aeysha Khalique. "Practical quantum teleportation of an unknown quantum state." Canadian Journal of Physics 95, no. 5 (2017): 498–503. http://dx.doi.org/10.1139/cjp-2016-0758.

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We present our model to teleport an unknown quantum state using entanglement between two distant parties. Our model takes into account experimental limitations due to contribution of multi-photon pair production of parametric down conversion source, inefficiency, dark counts of detectors, and channel losses. We use a linear optics setup for quantum teleportation of an unknown quantum state by the sender performing a Bell state measurement. Our theory successfully provides a model for experimentalists to optimize the fidelity by adjusting the experimental parameters. We apply our model to a rec
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7

Pal, Soham, Priya Batra, Tanjung Krisnanda, Tomasz Paterek, and T. S. Mahesh. "Experimental localisation of quantum entanglement through monitored classical mediator." Quantum 5 (June 17, 2021): 478. http://dx.doi.org/10.22331/q-2021-06-17-478.

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Quantum entanglement is a form of correlation between quantum particles that cannot be increased via local operations and classical communication. It has therefore been proposed that an increment of quantum entanglement between probes that are interacting solely via a mediator implies non-classicality of the mediator. Indeed, under certain assumptions regarding the initial state, entanglement gain between the probes indicates quantum coherence in the mediator. Going beyond such assumptions, there exist other initial states which produce entanglement between the probes via only local interactio
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8

Latorre, Jose I., and German Sierra. "Quantum computation of prime number functions." Quantum Information and Computation 14, no. 7&8 (2014): 577–88. http://dx.doi.org/10.26421/qic14.7-8-3.

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We propose a quantum circuit that creates a pure state corresponding to the quantum superposition of all prime numbers less than $2^n$, where $n$ is the number of qubits of the register. This Prime state can be built using Grover's algorithm, whose oracle is a quantum implementation of the classical Miller-Rabin primality test. The Prime state is highly entangled, and its entanglement measures encode number theoretical functions such as the distribution of twin primes or the Chebyshev bias. This algorithm can be further combined with the quantum Fourier transform to yield an estimate of the pr
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9

Rubino, Giulia, Lee A. Rozema, Francesco Massa, et al. "Experimental entanglement of temporal order." Quantum 6 (January 11, 2022): 621. http://dx.doi.org/10.22331/q-2022-01-11-621.

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The study of causal relations has recently been applied to the quantum realm, leading to the discovery that not all physical processes have a definite causal structure. While indefinite causal processes have previously been experimentally shown, these proofs relied on the quantum description of the experiments. Yet, the same experimental data could also be compatible with definite causal structures within different descriptions. Here, we present the first demonstration of indefinite temporal order outside of quantum formalism. We show that our experimental outcomes are incompatible with a clas
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10

Manzalini, Antonio, and Michele Amoretti. "End-to-End Entanglement Generation Strategies: Capacity Bounds and Impact on Quantum Key Distribution." Quantum Reports 4, no. 3 (2022): 251–63. http://dx.doi.org/10.3390/quantum4030017.

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A first quantum revolution has already brought quantum technologies into our everyday life for decades: in fact, electronics and optics are based on the quantum mechanical principles. Today, a second quantum revolution is underway, leveraging the quantum principles of superposition, entanglement and measurement, which were not fully exploited yet. International innovation activities and standardization bodies have identified four main application areas for quantum technologies and services: quantum secure communications, quantum computing, quantum simulation, and quantum sensing and metrology.
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11

Balinskiy, Michael, and Alexander Khitun. "Period finding and prime factorization using classical wave superposition." Journal of Applied Physics 131, no. 15 (2022): 153901. http://dx.doi.org/10.1063/5.0086428.

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Prime factorization is a procedure of determining the prime factors of a given number N that requires super-polynomial time for conventional digital computers. Peter Shor developed a polynomial-time algorithm for quantum computers. Period finding is the key part of the algorithm, which is accomplished with the help of quantum superposition of states and quantum entanglement. The period finding can be also accomplished using classical wave superposition. In this study, we present experimental data obtained on a multi-port spin wave interferometer made of Y3Fe2(FeO4)3. Number 817 was factorized
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12

Simon, David S., Gregg Jaeger, and Alexander V. Sergienko. "Quantum information in communication and imaging." International Journal of Quantum Information 12, no. 04 (2014): 1430004. http://dx.doi.org/10.1142/s0219749914300046.

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A brief introduction to quantum information theory in the context of quantum optics is presented. After presenting the fundamental theoretical basis of the subject, experimental evaluation of entanglement measures are discussed, followed by applications to communication and imaging.
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13

Großardt, André. "Dephasing and inhibition of spin interference from semi-classical self-gravitation." Classical and Quantum Gravity 38, no. 24 (2021): 245009. http://dx.doi.org/10.1088/1361-6382/ac36a6.

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Abstract We present a detailed derivation of a model to study effects of self-gravitation from semi-classical gravity, described by the Schrödinger–Newton equation, employing spin superposition states in inhomogeneous magnetic fields, as proposed recently for experiments searching for gravity induced entanglement. Approximations for the experimentally relevant limits are discussed. Results suggest that spin interferometry could provide a more accessible route towards an experimental test of quantum aspects of gravity than both previous proposals to test semi-classical gravity and the observati
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14

Najjari, Bennaceur, Shaofeng Zhang, Xinwen Ma, and Alexander B. Voitkiv. "Probing Atomic ‘Quantum Grating’ by Collisions with Charged Particles." Atoms 10, no. 4 (2022): 125. http://dx.doi.org/10.3390/atoms10040125.

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The wave function of an atom, which passed through a diffraction grating, is characterized by a regular space structure. Correspondingly, the interaction of another particle with this atom can be viewed as scattering on an ‘atomic quantum grating’ made of just a single atom. Probing this ‘grating’ by collisions with a charged projectile reveals few-body interference phenomena caused by the coherent contributions of its ‘slits’ to the transition amplitude (the superposition principle) and quantum entanglement of the particles involved. In particular, the spectra of electrons emitted from the at
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15

Neumann, Sebastian Philipp, Mirela Selimovic, Martin Bohmann, and Rupert Ursin. "Experimental entanglement generation for quantum key distribution beyond 1 Gbit/s." Quantum 6 (September 29, 2022): 822. http://dx.doi.org/10.22331/q-2022-09-29-822.

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Top-performance sources of photonic entanglement are an indispensable resource for many applications in quantum communication, most notably quantum key distribution. However, up to now, no source has been shown to simultaneously exhibit the high pair-creation rate, broad bandwidth, excellent state fidelity, and low intrinsic loss necessary for gigabit secure key rates. In this work, we present for the first time a source of polarization-entangled photon pairs at telecommunication wavelengths that covers all these needs of real-world quantum-cryptographic applications, thus enabling unprecedent
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16

Giarmatzi, Christina, and Fabio Costa. "Witnessing quantum memory in non-Markovian processes." Quantum 5 (April 26, 2021): 440. http://dx.doi.org/10.22331/q-2021-04-26-440.

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We present a method to detect quantum memory in a non-Markovian process. We call a process Markovian when the environment does not provide a memory that retains correlations across different system-environment interactions. We define two types of non-Markovian processes, depending on the required memory being classical or quantum. We formalise this distinction using the process matrix formalism, through which a process is represented as a multipartite state. Within this formalism, a test for entanglement in a state can be mapped to a test for quantum memory in the corresponding process. This a
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17

Bian, Zhi-Hao, and Hui Wu. "Experimental Certification of Quantum Entanglement Based on the Classical Complementary Correlations of Two-Qubit States." Photonics 8, no. 12 (2021): 525. http://dx.doi.org/10.3390/photonics8120525.

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Quantum entanglement is one of the essential resources in quantum information processing. It is of importance to verify whether a quantum state is entangled. At present, a typical quantum certification focused on the classical correlations has attracted widespread attention. Here, we experimentally investigate the relation between quantum entanglement and the classical complementary correlations based on the mutual information, Pearson correlation coefficient and mutual predictability of two-qubit states. Our experimental results show the classical correlations for complementary properties hav
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18

Bhaumik, Mani L. "Can Decoherence Solve the Measurement Problem?" Quanta 11, no. 1 (2022): 115–23. http://dx.doi.org/10.12743/quanta.v11i1.208.

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The quantum decoherence program has become more attractive in providing an acceptable solution for the long-standing quantum measurement problem. Decoherence by quantum entanglement happens very quickly to entangle the quantum system with the environment including the detector. But in the final stage of measurement, acquiring the unentangled pointer states poses some problems. Recent experimental observations of the effect of the ubiquitous quantum vacuum fluctuations in destroying quantum entanglement appears to provide a solution.Quanta 2022; 11: 115–123.
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19

Su, Xiaolong, Aihong Tan, Xiaojun Jia, Qing Pan, Changde Xie, and Kunchi Peng. "Experimental demonstration of quantum entanglement between frequency-nondegenerate optical twin beams." Optics Letters 31, no. 8 (2006): 1133. http://dx.doi.org/10.1364/ol.31.001133.

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20

Brookes, Jennifer C. "Quantum effects in biology: golden rule in enzymes, olfaction, photosynthesis and magnetodetection." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 473, no. 2201 (2017): 20160822. http://dx.doi.org/10.1098/rspa.2016.0822.

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Despite certain quantum concepts, such as superposition states, entanglement, ‘spooky action at a distance’ and tunnelling through insulating walls, being somewhat counterintuitive, they are no doubt extremely useful constructs in theoretical and experimental physics. More uncertain, however, is whether or not these concepts are fundamental to biology and living processes. Of course, at the fundamental level all things are quantum, because all things are built from the quantized states and rules that govern atoms. But when does the quantum mechanical toolkit become the best tool for the job? T
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21

Nery, Marcello, Marco Túlio Quintino, Philippe Allard Guérin, Thiago O. Maciel, and Reinaldo O. Vianna. "Simple and maximally robust processes with no classical common-cause or direct-cause explanation." Quantum 5 (September 9, 2021): 538. http://dx.doi.org/10.22331/q-2021-09-09-538.

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Guided by the intuition of coherent superposition of causal relations, recent works presented quantum processes without classical common-cause and direct-cause explanation, that is, processes which cannot be written as probabilistic mixtures of quantum common-cause and quantum direct-cause relations (CCDC). In this work, we analyze the minimum requirements for a quantum process to fail to admit a CCDC explanation and present "simple" processes, which we prove to be the most robust ones against general noise. These simple processes can be realized by preparing a maximally entangled state and ap
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22

Navascués, Miguel, Flavio Baccari, and Antonio Acín. "Entanglement marginal problems." Quantum 5 (November 25, 2021): 589. http://dx.doi.org/10.22331/q-2021-11-25-589.

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We consider the entanglement marginal problem, which consists of deciding whether a number of reduced density matrices are compatible with an overall separable quantum state. To tackle this problem, we propose hierarchies of semidefinite programming relaxations of the set of quantum state marginals admitting a fully separable extension. We connect the completeness of each hierarchy to the resolution of an analog classical marginal problem and thus identify relevant experimental situations where the hierarchies are complete. For finitely many parties on a star configuration or a chain, we find
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23

Fragkos, Vasileios, Michael Kopp, and Igor Pikovski. "On inference of quantization from gravitationally induced entanglement." AVS Quantum Science 4, no. 4 (2022): 045601. http://dx.doi.org/10.1116/5.0101334.

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Observable signatures of the quantum nature of gravity at low energies have recently emerged as a promising new research field. One prominent avenue is to test for gravitationally induced entanglement between two mesoscopic masses prepared in spatial superposition. Here, we analyze such proposals and what one can infer from them about the quantum nature of gravity as well as the electromagnetic analogues of such tests. We show that it is not possible to draw conclusions about mediators: even within relativistic physics, entanglement generation can equally be described in terms of mediators or
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24

Fu, Shuangshuang, and Shunlong Luo. "Quantifying Decoherence via Increases in Classicality." Entropy 23, no. 12 (2021): 1594. http://dx.doi.org/10.3390/e23121594.

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As a direct consequence of the interplay between the superposition principle of quantum mechanics and the dynamics of open systems, decoherence is a recurring theme in both foundational and experimental exploration of the quantum realm. Decoherence is intimately related to information leakage of open systems and is usually formulated in the setup of “system + environment” as information acquisition of the environment (observer) from the system. As such, it has been mainly characterized via correlations (e.g., quantum mutual information, discord, and entanglement). Decoherence combined with red
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25

Guha Majumdar, Mrittunjoy, and C. M. Chandrashekar. "Polarization-path-frequency entanglement using interferometry and frequency shifters." Journal of Physics B: Atomic, Molecular and Optical Physics 55, no. 4 (2022): 045501. http://dx.doi.org/10.1088/1361-6455/ac5261.

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Abstract Higher dimensional Hilbert space along with ability to control multiple degrees of freedom of photon and entangle them has enabled new quantum protocols for various quantum information processing applications. Here, we propose a scheme to generate and control polarization-path-frequency entanglement using the operative elements required to implement a polarization-controlled quantum walk in the path (position) space and frequency domain. Hyperentangled states manifests in the controlled dynamics using an interferometric setup where half-wave plates, beam-splitters and frequency shifte
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26

Afik, Yoav, and Juan Ramón Muñoz de Nova. "Quantum information with top quarks in QCD." Quantum 6 (September 29, 2022): 820. http://dx.doi.org/10.22331/q-2022-09-29-820.

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Top quarks represent unique high-energy systems since their spin correlations can be measured, thus allowing to study fundamental aspects of quantum mechanics with qubits at high-energy colliders. We present here the general framework of the quantum state of a top-antitop (tt¯) quark pair produced through quantum chromodynamics (QCD) in a high-energy collider. We argue that, in general, the total quantum state that can be probed in a collider is given in terms of the production spin density matrix, which necessarily gives rise to a mixed state. We compute the quantum state of a tt&a
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27

Harris, Nicholas C., Darius Bunandar, Mihir Pant, et al. "Large-scale quantum photonic circuits in silicon." Nanophotonics 5, no. 3 (2016): 456–68. http://dx.doi.org/10.1515/nanoph-2015-0146.

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AbstractQuantum information science offers inherently more powerful methods for communication, computation, and precision measurement that take advantage of quantum superposition and entanglement. In recent years, theoretical and experimental advances in quantum computing and simulation with photons have spurred great interest in developing large photonic entangled states that challenge today’s classical computers. As experiments have increased in complexity, there has been an increasing need to transition bulk optics experiments to integrated photonics platforms to control more spatial modes
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28

Sun, Kai, Yan Wang, Zheng-Hao Liu, et al. "Experimental quantum entanglement and teleportation by tuning remote spatial indistinguishability of independent photons." Optics Letters 45, no. 23 (2020): 6410. http://dx.doi.org/10.1364/ol.401735.

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29

Cassemiro, K. N., A. S. Villar, M. Martinelli, and P. Nussenzveig. "The quest for three-color entanglement: experimental investigation of new multipartite quantum correlations." Optics Express 15, no. 26 (2007): 18236. http://dx.doi.org/10.1364/oe.15.018236.

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30

Pashin, Dmitrii, Marina Bastrakova, Arkady Satanin, and Nikolay Klenov. "Bifurcation Oscillator as an Advanced Sensor for Quantum State Control." Sensors 22, no. 17 (2022): 6580. http://dx.doi.org/10.3390/s22176580.

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We study bifurcation behavior of a high-quality (high-Q) Josephson oscillator coupled to a superconducting qubit. It is shown that the probability of capture into the state of dynamic equilibrium is sensitive to qubit states. On this basis we present a new measurement method for the superposition state of a qubit due to its influence on transition probabilities between oscillator levels located in the energy region near the classical separatrix. The quantum-mechanical behavior of a bifurcation oscillator is also studied, which makes it possible to understand the mechanism of "entanglement" of
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31

Wang, Haigang, and Kan He. "Quantum Tomography of Two-Qutrit Werner States." Photonics 9, no. 10 (2022): 741. http://dx.doi.org/10.3390/photonics9100741.

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In this article, we introduce a framework for two-qutrit Werner states tomography with Gaussian noise. The measurement scheme is based on the symmetric, informationally complete positive operator-valued measure. To make the framework realistic, we impose the Gaussian noise on the measured states numbers. Through numerical simulation, we successfully reconstructed the two-qutrit Werner states in various experimental scenarios and analyzed the optimal scenario from four aspects: fidelity, purity, entanglement, and coherence.
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32

Benabdallah, Fadwa, Hamid Arian Zad, Mohammed Daoud, and Nerses Ananikian. "Dynamics of quantum correlations in a qubit-qutrit spin system under random telegraph noise." Physica Scripta 96, no. 12 (2021): 125116. http://dx.doi.org/10.1088/1402-4896/ac3c5c.

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Abstract We study the dimensionless time evolution of the logarithmic negativity and geometric quantum discord of a qubit-qutrit XXX spin model under the both Markovian and non-Markovian noise channels. We find that at a special temperature interval the quantum entanglement based on the logarithmic negativity reveals entanglement sudden deaths together with revivals. The revival phenomenon is due to the non-Markovianity resulting from the feedback effect of the environment. At high temperatures, the scenario of death and revival disappears. The geometric quantum discord evolves alternatively v
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33

Wang, Jinzhao. "The refined quantum extremal surface prescription from the asymptotic equipartition property." Quantum 6 (February 16, 2022): 655. http://dx.doi.org/10.22331/q-2022-02-16-655.

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Information-theoretic ideas have provided numerous insights in the progress of fundamental physics, especially in our pursuit of quantum gravity. In particular, the holographic entanglement entropy is a very useful tool in studying AdS/CFT, and its efficacy is manifested in the recent black hole page curve calculation. On the other hand, the one-shot information-theoretic entropies, such as the smooth min/max-entropies, are less discussed in AdS/CFT. They are however more fundamental entropy measures from the quantum information perspective and should also play pivotal roles in holography. We
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34

Issah, Ibrahim, Mohsin Habib, and Humeyra Caglayan. "Long-range qubit entanglement via rolled-up zero-index waveguide." Nanophotonics 10, no. 18 (2021): 4579–89. http://dx.doi.org/10.1515/nanoph-2021-0453.

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Abstract Preservation of an entangled state in a quantum system is one of the major goals in quantum technological applications. However, entanglement can be quickly lost into dissipation when the effective interaction among the qubits becomes smaller compared to the noise-injection from the environment. Thus, a medium that can sustain the entanglement of distantly spaced qubits is essential for practical implementations. This work introduces the fabrication of a rolled-up zero-index waveguide which can serve as a unique reservoir for the long-range qubit–qubit entanglement. We also present th
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35

Guo, Jingkun, and Simon Gröblacher. "Coherent feedback in optomechanical systems in the sideband-unresolved regime." Quantum 6 (November 3, 2022): 848. http://dx.doi.org/10.22331/q-2022-11-03-848.

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Preparing macroscopic mechanical resonators close to their motional quantum groundstate and generating entanglement with light offers great opportunities in studying fundamental physics and in developing a new generation of quantum applications. Here we propose an experimentally interesting scheme, which is particularly well suited for systems in the sideband-unresolved regime, based on coherent feedback with linear, passive optical components to achieve groundstate cooling and photon-phonon entanglement generation with optomechanical devices. We find that, by introducing an additional passive
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36

Pu, Yun-Fei, Sheng Zhang, Yu-Kai Wu, et al. "Experimental demonstration of memory-enhanced scaling for entanglement connection of quantum repeater segments." Nature Photonics 15, no. 5 (2021): 374–78. http://dx.doi.org/10.1038/s41566-021-00764-4.

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37

Ma, Teng-Fei, Min-Jie Wang, Sheng-Zhi Wang, et al. "Experimental study of retrieval efficiency of Duan-Lukin-Cirac-Zoller quantum memory by optical cavity-enhanced." Acta Physica Sinica 71, no. 2 (2022): 020301. http://dx.doi.org/10.7498/aps.71.20210881.

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<sec>Long-distance entanglement distribution is an important task for quantum communication, but difficult to achieve due to the loss of photons in optical fiber transmission. Quantum repeater is a scheme to solve this problem. In this scheme, the long distance of entanglement distribution is divided into several small parts, the entanglement is established first at both ends of each part, then, the entanglement distance is extended through the entanglement exchange of adjacent interval parts, in order to achieve the long distance entanglement distribution. Of them, the Duan-Lukin-Cirac-
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38

Isaev, A. A. "Two Signs of Superfluid Liquid in a Suspension of CdSe/ZnS Quantum Dots at Room Temperature." International Journal of Optics 2019 (March 4, 2019): 1–8. http://dx.doi.org/10.1155/2019/4638148.

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The paper presents experimental results of the interaction of a focused optical beam with a suspension of CdSe/ZnS quantum dots in toluene. Two autographs characteristic only of the behavior of a superfluid quantum liquid were experimentally observed. The first was the fountain effect from the region of local heating of the suspension with an optical beam; the second was the complete “creeping out” of the QDs suspension in the form of a thin film along the walls of the cuvette in which the suspension was located. The results of the work suggest that superfluid quantum liquid may arise at room
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39

Manukhova, Alisa D., Andrey A. Rakhubovsky, and Radim Filip. "Atom-Mechanical Hong-Ou-Mandel Interference." Quantum 6 (April 13, 2022): 686. http://dx.doi.org/10.22331/q-2022-04-13-686.

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Quantum coupling between mechanical oscillators and atomic gases generating entanglement has been recently experimentally demonstrated using their subsequent interaction with light. The next step is to build a hybrid atom-mechanical quantum gate showing bosonic interference effects of single quanta in the atoms and oscillators. We propose an experimental test of Hong-Ou-Mandel interference between single phononic excitation and single collective excitation of atoms using the optical connection between them. A single optical pulse is sufficient to build a hybrid quantum-nondemolition gate to ob
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40

Michaels, Cathryn P., Jesús Arjona Martínez, Romain Debroux, et al. "Multidimensional cluster states using a single spin-photon interface coupled strongly to an intrinsic nuclear register." Quantum 5 (October 19, 2021): 565. http://dx.doi.org/10.22331/q-2021-10-19-565.

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Photonic cluster states are a powerful resource for measurement-based quantum computing and loss-tolerant quantum communication. Proposals to generate multi-dimensional lattice cluster states have identified coupled spin-photon interfaces, spin-ancilla systems, and optical feedback mechanisms as potential schemes. Following these, we propose the generation of multi-dimensional lattice cluster states using a single, efficient spin-photon interface coupled strongly to a nuclear register. Our scheme makes use of the contact hyperfine interaction to enable universal quantum gates between the inter
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41

Heo, Jino, and Seong-Gon Choi. "Photonic schemes of distribution and reconstruction of an entangled state from hybrid entanglement between polarization and time-bin via quantum dot." Physica Scripta 97, no. 4 (2022): 045101. http://dx.doi.org/10.1088/1402-4896/ac4b33.

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Abstract We propose photonic schemes for the distribution and reconstruction of a two-qubit entangled state using a hybrid entangled state under a noisy quantum channel. First, to generate a hybrid entangled state correlated with polarizations and time-bins, we employ a quantum dot (QD)-cavity system (nonlinear optical gate) and linear optical devices to implement controlled operation. These schemes can achieve the distribution and reconstruction of a two-qubit entangled state from hybrid entanglement by utilizing only linear optical devices without a QD-cavity system (i.e., a nonlinear optica
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42

Adler, Thomas, Manuel Erhard, Mario Krenn, Johannes Brandstetter, Johannes Kofler, and Sepp Hochreiter. "Quantum Optical Experiments Modeled by Long Short-Term Memory." Photonics 8, no. 12 (2021): 535. http://dx.doi.org/10.3390/photonics8120535.

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We demonstrate how machine learning is able to model experiments in quantum physics. Quantum entanglement is a cornerstone for upcoming quantum technologies, such as quantum computation and quantum cryptography. Of particular interest are complex quantum states with more than two particles and a large number of entangled quantum levels. Given such a multiparticle high-dimensional quantum state, it is usually impossible to reconstruct an experimental setup that produces it. To search for interesting experiments, one thus has to randomly create millions of setups on a computer and calculate the
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43

Dat, Tran Quang, and Truong Minh Duc. "Entanglement, nonlocal features, quantum teleportation of two-mode squeezed vacuum states with superposition of photon-pair addition and subtraction operations." Optik 257 (May 2022): 168744. http://dx.doi.org/10.1016/j.ijleo.2022.168744.

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44

Zhan, Yuan, Paul Hilaire, Edwin Barnes, Sophia E. Economou, and Shuo Sun. "Performance analysis of quantum repeaters enabled by deterministically generated photonic graph states." Quantum 7 (February 16, 2023): 924. http://dx.doi.org/10.22331/q-2023-02-16-924.

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By encoding logical qubits into specific types of photonic graph states, one can realize quantum repeaters that enable fast entanglement distribution rates approaching classical communication. However, the generation of these photonic graph states requires a formidable resource overhead using traditional approaches based on linear optics. Overcoming this challenge, a number of new schemes have been proposed that employ quantum emitters to deterministically generate photonic graph states. Although these schemes have the potential to significantly reduce the resource cost, a systematic compariso
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45

Xie, Y. D., Q. Wu, X. C. Li, et al. "Who are the dominant players in the experimental field of quantum entanglement? A bibliometric analysis." Quantum Electronics 51, no. 8 (2021): 744–50. http://dx.doi.org/10.1070/qel17599.

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46

Chichilnisky, Graciela. "The Topology of Quantum Theory and Social Choice." Quantum Reports 4, no. 2 (2022): 201–20. http://dx.doi.org/10.3390/quantum4020014.

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Based on the axioms of quantum theory, we identify a class of topological singularities that encode a fundamental difference between classic and quantum probability, and explain quantum theory’s puzzles and phenomena in simple mathematical terms so they are no longer ‘quantum paradoxes’. The singularities provide also new experimental insights and predictions that are presented in this article and establish a surprising new connection between the physical and social sciences. The key is the topology of spaces of quantum events and of the frameworks postulated by these axioms. These are quite d
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47

Sciara, Stefania, Piotr Roztocki, Bennet Fischer, et al. "Scalable and effective multi-level entangled photon states: a promising tool to boost quantum technologies." Nanophotonics 10, no. 18 (2021): 4447–65. http://dx.doi.org/10.1515/nanoph-2021-0510.

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Abstract Multi-level (qudit) entangled photon states are a key resource for both fundamental physics and advanced applied science, as they can significantly boost the capabilities of novel technologies such as quantum communications, cryptography, sensing, metrology, and computing. The benefits of using photons for advanced applications draw on their unique properties: photons can propagate over long distances while preserving state coherence, and they possess multiple degrees of freedom (such as time and frequency) that allow scalable access to higher dimensional state encoding, all while mai
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48

Khatri, Sumeet. "On the design and analysis of near-term quantum network protocols using Markov decision processes." AVS Quantum Science 4, no. 3 (2022): 030501. http://dx.doi.org/10.1116/5.0084653.

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The quantum internet is one of the frontiers of quantum information science. It will revolutionize the way we communicate and do other tasks, and it will allow for tasks that are not possible using the current, classical internet. The backbone of a quantum internet is entanglement distributed globally in order to allow for such novel applications to be performed over long distances. Experimental progress is currently being made to realize quantum networks on a small scale, but much theoretical work is still needed in order to understand how best to distribute entanglement, especially with the
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49

Yang, Shou-Bang, Wen Ning, Ri-Hua Zheng, Zhen-Biao Yang, and Shi-Biao Zheng. "Deterministic Entanglement Swapping with Hybrid Discrete- and Continuous-Variable Systems." Photonics 9, no. 6 (2022): 368. http://dx.doi.org/10.3390/photonics9060368.

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The study of entanglement between discrete and continuous variables is an important theoretical and experimental topic in quantum information processing, for which entanglement swapping is one of the interesting elements. Entanglement swapping allows two particles without interacting with each other in any way, to form an entangled state by the action of another pair of entangled particles. In this paper, we propose an experimentally feasible scheme to realize deterministic entanglement swapping in the hybrid system with discrete and continuous variables. The process is achieved by preparing t
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50

Wenhao Zhou, Yao Wang, Man-Hong Yung, and Xianmin Jin. "Progress in Integrated Optical Quantum Computing Research." Acta Physica Sinica, 2022, 0. http://dx.doi.org/10.7498/aps.71.20221782.

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Quantum computing, based on the inherent superposition and entanglement properties of quantum states, can break through the limits of classical computing power. However, under the current technical conditions, the number of qubits that can be manipulated is still limited. In addition, the preparation of high-precision quantum gates and additional quantum error correction systems acquires more auxiliary bits and extra cost much. Therefore, the realization of a universal fault-tolerant quantum computer seems to be a long-term goal.<br />The development of analog quantum computing is a tran
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