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Journal articles on the topic 'Quantum information. eng'

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Published: 4 June 2021

Last updated: 2 February 2022

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1

Zizzi, Paola. "Quantum Information Hidden in Quantum Fields." Quantum Reports 2, no. 3 (2020): 459–90. http://dx.doi.org/10.3390/quantum2030033.

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We investigate a possible reduction mechanism from (bosonic) Quantum Field Theory (QFT) to Quantum Mechanics (QM), in a manner that could explain the apparent loss of degrees of freedom of the original theory in terms of quantum information in the reduced one. This reduction mechanism consists mainly of performing an ansatz on the boson field operator, which takes into account quantum foam and non-commutative geometry. Through the reduction mechanism, QFT reveals its hidden internal structure, which is a quantum network of maximally entangled multipartite states. In the end, a new approach to

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Ivancova, Olga, Vladimir Korenkov, Olga Tyatyushkina, Sergey Ulyanov, and Toshio Fukuda. "Quantum supremacy in end-to-end intelligent IT. Pt. I:Quantum software engineering–quantum gate level applied models simulators." System Analysis in Science and Education, no. 1 (2020) (2020): 52–84. http://dx.doi.org/10.37005/2071-9612-2020-1-52-84.

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Principles and methodologies of quantum algorithmic gates design for master course and PhD students in computer science, control engineering and intelligent robotics described. The possibilities of quantum algorithmic gates simulation on classical computers discussed. Applications of quantum gate of nanotechnology in intelligent quantum control introduced. Anew approach to a circuit implementation design of quantum algorithm gates for fast quantum massive parallel computing presented. The main attention focused on the development of design method of fast quantum algorithm operators as superpos

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KHRENNIKOV, ANDREI. "VON NEUMANN AND LUDERS POSTULATES AND QUANTUM INFORMATION THEORY." International Journal of Quantum Information 07, no. 07 (2009): 1303–11. http://dx.doi.org/10.1142/s0219749909005845.

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This note is devoted to some foundational aspects of quantum mechanics (QM) related to quantum information (QI), especially quantum teleportation and "one way quantum computing." We emphasize the role of the projection postulate (determining post-measurement states) in QI and the difference between its Lüders and von Neumann versions. As is well-known, these postulates differ in the case of observables with degenerate spectra. Such observables are important in operations with entangled states: any measurement on one subsystem is represented by an observable with degenerate spectrum in the Hilb

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Khrennikov, Andrei. "On Quantum-Like Probabilistic Structure of Mental Information." Open Systems & Information Dynamics 11, no. 03 (2004): 267–75. http://dx.doi.org/10.1023/b:opsy.0000047570.68941.9d.

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We describe methodology of cognitive experiments (based on interference of probabilities for mental observables) which could verify quantum-like structure of mental information, namely, interference of probabilities for incompatible observables. In principle, such experiments can be performed in psychology, cognitive, and social sciences. In fact, the general contextual probability theory predicts not only quantum-like trigonometric (cos θ) interference of probabilities, but also hyperbolic (cosh θ) interference of probabilities (as well as hyper-trigonometric). In principle, statistical data

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Lupo, Cosmo, and Stefano Pirandola. "Super-additivity and entanglement assistance in quantum reading." Quantum Information and Computation 17, no. 7&8 (2017): 611–22. http://dx.doi.org/10.26421/qic17.7-8-4.

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Quantum information theory determines the maximum rates at which information can be transmitted through physical systems described by quantum mechanics. Here we consider the communication protocol known as quantum reading. Quantum reading is a protocol for retrieving the information stored in a digital memory by using a quantum probe, e.g., shining quantum states of light to read an optical memory. In a variety of situations using a quantum probe enhances the performance of the reading protocol in terms of fidelity, data density and energy efficiency. Here we review and characterize the quantu

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Sun, Bo, Abdullah M. Iliyasu, Fei Yan, Fangyan Dong, and Kaoru Hirota. "An RGB Multi-Channel Representation for Images on Quantum Computers." Journal of Advanced Computational Intelligence and Intelligent Informatics 17, no. 3 (2013): 404–17. http://dx.doi.org/10.20965/jaciii.2013.p0404.

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RGB multi channel representation is proposed for images on quantum computers (MCQI) that captures information about colors (RGB channels) and their corresponding positions in an image in a normalized quantum state. The proposed representation makes it possible to store the RGB information about an image simultaneously by using 2n+3 qubits for encoding 2n× 2npixel images, whereas pixel-wise processing is necessary in many other quantum image representations, e.g., qubit lattice, grid qubit, and quantum lattice. Simulation of storage and retrieval of MCQI images using human facial images demonst

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Bennett, C. H. "A resource-based view of quantum information." Quantum Information and Computation 4, no. 6&7 (2004): 460–66. http://dx.doi.org/10.26421/qic4.6-7-5.

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We survey progress in understanding quantum information in terms of equivalences, reducibilities, and asymptotically achievable rates for transformations among nonlocal resources such as classical communication, entanglement, and particular quantum states or channels. In some areas, eg source coding, there are straightforward parallels to classical information theory; in others eg entanglement-assisted communication, new effects and tradeoffs appear that are beginning to be fairly well understood, or the remaining uncertainty has become focussed on a few simple open questions, such as conjectu

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van Enk, S. J., and T. Rudolph. "Quantum communication protocols using the vacuum." Quantum Information and Computation 3, no. 5 (2003): 423–30. http://dx.doi.org/10.26421/qic3.5-3.

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We speculate what quantum information protocols can be implemented between two accelerating observers using the vacuum. Whether it is in principle possible or not to implement a protocol depends on whether the aim is to end up with classical information or quantum information. Thus, unconditionally secure coin flipping seems possible but not teleportation.

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Yevseiev, Serhii, Alla Gavrilova, Bogdan Tomashevsky, and Firuz Samadov. "Research of crypto-code designs construction for using in post quantum cryptography." Development Management 16, no. 4 (2019): 26–39. http://dx.doi.org/10.21511/dm.4(4).2018.03.

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The article analyzes construction of crypto-code designs (CCDs) on the basis of asymmetric Mac-Alice and Niederreiter crypto-code systems on elliptical (EC) and modified elliptic codes (MEC), which, in the conditions of post-quantum cryptography, allow to provide a guaranteed level of crypto stability, to counteract the modern Attacks and attack by V. Sidelnikov on the theoretical code schemes of McAlias and Niederreiter. Schemes of hybrid crypto-code designs constraction the lossy codes are addressed. Methods of constructing mechanisms of confidentiality and integrity of banking information r

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10

Khrennikov, Andrei. "Randomness: Quantum versus classical." International Journal of Quantum Information 14, no. 04 (2016): 1640009. http://dx.doi.org/10.1142/s0219749916400098.

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Recent tremendous development of quantum information theory has led to a number of quantum technological projects, e.g. quantum random generators. This development had stimulated a new wave of interest in quantum foundations. One of the most intriguing problems of quantum foundations is the elaboration of a consistent and commonly accepted interpretation of a quantum state. Closely related problem is the clarification of the notion of quantum randomness and its interrelation with classical randomness. In this short review, we shall discuss basics of classical theory of randomness (which by its

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Licata, Ignazio, and Leonardo Chiatti. "Event-Based Quantum Mechanics: A Context for the Emergence of Classical Information." Symmetry 11, no. 2 (2019): 181. http://dx.doi.org/10.3390/sym11020181.

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This paper explores an event-based version of quantum mechanics which differs from the commonly accepted one, even though the usual elements of quantum formalism, e.g., the Hilbert space, are maintained. This version introduces as primary element the occurrence of micro-events induced by usual physical (mechanical, electromagnetic and so on) interactions. These micro-events correspond to state reductions and are identified with quantum jumps, already introduced by Bohr in his atomic model and experimentally well established today. Macroscopic bodies are defined as clusters of jumps; the emerge

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12

Wu, Fan, Ming-Qiang Bai, Yu-Chun Zhang, Ren-Ju Liu, and Zhi-Wen Mo. "Cyclic and cyclic controlled quantum teleportation in a high-dimension system." International Journal of Quantum Information 18, no. 04 (2020): 2050012. http://dx.doi.org/10.1142/s0219749920500124.

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In this paper, two schemes for cyclic quantum teleportation (CQT) and cyclic controlled quantum teleportation (CCQT) in a high-dimension system are proposed. In the first scheme, three distant agents, Alice, Bob and Charlie, are not only the senders but also the receivers, and via the six-qutrit entangled state as the quantum channel, Alice can transfer her quantum information to Bob, at the same time, Bob can transfer his quantum information to Charlie and Charlie can transfer his quantum information to Alice. While for the second scheme, there is one controller David, and only with the help

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SCHULTE-HERBRÜGGEN, THOMAS, STEFFEN J. GLASER, GUNTHER DIRR, and UWE HELMKE. "GRADIENT FLOWS FOR OPTIMIZATION IN QUANTUM INFORMATION AND QUANTUM DYNAMICS: FOUNDATIONS AND APPLICATIONS." Reviews in Mathematical Physics 22, no. 06 (2010): 597–667. http://dx.doi.org/10.1142/s0129055x10004053.

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Many challenges in quantum information and quantum control root in constrained optimization problems on finite-dimensional quantum systems. The constraints often arise from two facts: (i) quantum dynamic state spaces are naturally smooth manifolds (orbits of the respective initial states) rather than being Hilbert spaces; (ii) the dynamics of the respective quantum system may be restricted to a proper subset of the entire state space. Mathematically, either case can be treated by constrained optimization over the reachable set of an underlying control system. Thus, whenever the reachable set t

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Shuai, Shuangshuang, Na Chen, and Bin Yan. "Bidirectional Quantum Communication through the Composite GHZ-GHZ Channel." Applied Sciences 10, no. 16 (2020): 5500. http://dx.doi.org/10.3390/app10165500.

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This paper solved the problem of transmitting quantum bits (qubits) in a multi-hop and bidirectional way. Considering that the Greenberger–Horne–Zeilinger (GHZ) states are less prone to the decoherence effects caused by the surrounding environment, we proposed a bidirectional quantum communication scheme based on quantum teleportation and the composite GHZ-GHZ states. On a multi-hop quantum path, different types of GHZ states are previously shared between the adjacent intermediate nodes. To implement qubit transmission, the sender and intermediate nodes perform quantum measurements in parallel

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Zhang, Hongliang, Dongxiao Quan, Changhua Zhu, and Zhigang Li. "A Quantum Cryptography Communication Network Based on Software Defined Network." ITM Web of Conferences 17 (2018): 01008. http://dx.doi.org/10.1051/itmconf/20181701008.

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With the development of the Internet, information security has attracted great attention in today’s society, and quantum cryptography communication network based on quantum key distribution (QKD) is a very important part of this field, since the quantum key distribution combined with one-time-pad encryption scheme can guarantee the unconditional security of the information. The secret key generated by quantum key distribution protocols is a very valuable resource, so making full use of key resources is particularly important. Software definition network (SDN) is a new type of network architect

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16

Brovko, Oleg, Alexey Eliseev, Vladimir Kekelidze, et al. "Necessity of intelligent control systems application in experimental nuclear physics complexes (NICA type).PT.I: Problems of unforeseen situations." System Analysis in Science and Education, no. 4 (2019) (2019): 32–57. http://dx.doi.org/10.37005/2071-9612-2019-4-32-57.

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In the article (Part I) the necessity of application of end-to-end quantum technologies of intelligent computing in problems of structure elements control of complex experimental accelerator complex NICA is analyzed. Given a description of possible unforeseen situations, their classification is given to include adjustments to the decision-making application of production rules, logic knowledge bases of intelligent control systems based on emerging information risk increment. In the second part (Part II) the proposed two-level intelligent control system, a physical experimental setup of the NIC

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Shor, Oded, Amir Glik, Amit Yaniv-Rosenfeld, et al. "EEG p-adic quantum potential accurately identifies depression, schizophrenia and cognitive decline." PLOS ONE 16, no. 8 (2021): e0255529. http://dx.doi.org/10.1371/journal.pone.0255529.

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No diagnostic or predictive instruments to help with early diagnosis and timely therapeutic intervention are available as yet for most neuro-psychiatric disorders. A quantum potential mean and variability score (qpmvs), to identify neuropsychiatric and neurocognitive disorders with high accuracy, based on routine EEG recordings, was developed. Information processing in the brain is assumed to involve integration of neuronal activity in various areas of the brain. Thus, the presumed quantum-like structure allows quantification of connectivity as a function of space and time (locality) as well a

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18

Garcia-Escartin, J. C., and P. Chamorro-Posada. "Quantum multiplexing with optical coherent states." Quantum Information and Computation 9, no. 7&8 (2009): 573–93. http://dx.doi.org/10.26421/qic9.7-8-2.

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In this paper, we propose a novel quantum multiple access technique based on optical coherent states. The information of several coherent state optical qubits is combined into a single qudit, which is the superposition of almost orthogonal coherent states. The original information is encoded into a new Hilbert space with the help of a quantum multiplexer (QMUX) and then recovered at the other end with a quantum demultiplexer (QDEMUX). We introduce the optical tools that complete the coherence state quantum computation model and give the desired circuits. The proposed system can admit a number

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Diazdelacruz, Jose, and Miguel Martin-Delgado. "Quantum Information Remote Carnot Engines and Voltage Transformers." Entropy 21, no. 2 (2019): 127. http://dx.doi.org/10.3390/e21020127.

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A physical system out of thermal equilibrium is a resource for obtaining useful work when a heat bath at some temperature is available. Information Heat Engines are the devices which generalize the Szilard cylinders and make use of the celebrated Maxwell demons to this end. In this paper, we consider a thermo-chemical reservoir of electrons which can be exchanged for entropy and work. Qubits are used as messengers between electron reservoirs to implement long-range voltage transformers with neither electrical nor magnetic interactions between the primary and secondary circuits. When they are a

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20

Martin, Jérôme. "Cosmic Inflation, Quantum Information and the Pioneering Role of John S Bell in Cosmology." Universe 5, no. 4 (2019): 92. http://dx.doi.org/10.3390/universe5040092.

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According to the theory of cosmic inflation, the large scale structures observed in our Universe (galaxies, clusters of galaxies, Cosmic Background Microwave—CMB—anisotropy...) are of quantum mechanical origin. They are nothing but vacuum fluctuations, stretched to cosmological scales by the cosmic expansion and amplified by gravitational instability. At the end of inflation, these perturbations are placed in a two-mode squeezed state with the strongest squeezing ever produced in Nature (much larger than anything that can be made in the laboratory on Earth). This article studies whether astrop

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Ohya, Masanori. "Quantum Information and Probability: My Collaboration with Professor Ingarden." Open Systems & Information Dynamics 18, no. 02 (2011): 109–28. http://dx.doi.org/10.1142/s1230161211000078.

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I first met Professor Ingarden nearly 30 years ago. Since then, he visited my University in Tokyo many times and I also often visited him in Toruń. In this paper, I will recall our scientific collaboration and I will review what I have done under his advice. Moreover, I will report on my recent work with A. Khrennikov on formulating new probability law appearing in the context-dependent adaptive systems, important e.g. in biology.

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22

Abbott, Alastair A., Julian Wechs, Dominic Horsman, Mehdi Mhalla, and Cyril Branciard. "Communication through coherent control of quantum channels." Quantum 4 (September 24, 2020): 333. http://dx.doi.org/10.22331/q-2020-09-24-333.

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A completely depolarising quantum channel always outputs a fully mixed state and thus cannot transmit any information. In a recent Letter\cite{ebler18}, it was however shown that if a quantum state passes through two such channels in a quantum superposition of different orders---a setup known as the ``quantum switch''---then information can nevertheless be transmitted through the channels. Here, we show that a similar effect can be obtained when one coherently controls between sending a target system through one of two identical depolarising channels. Whereas it is tempting to attribute this e

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Khrennikov, Andrei, Alexander Alodjants, Anastasiia Trofimova, and Dmitry Tsarev. "On Interpretational Questions for Quantum-Like Modeling of Social Lasing." Entropy 20, no. 12 (2018): 921. http://dx.doi.org/10.3390/e20120921.

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The recent years were characterized by increasing interest to applications of the quantum formalism outside physics, e.g., in psychology, decision-making, socio-political studies. To distinguish such approach from quantum physics, it is called quantum-like. It is applied to modeling socio-political processes on the basis of the social laser model describing stimulated amplification of social actions. The main aim of this paper is establishing the socio-psychological interpretations of the quantum notions playing the basic role in lasing modeling. By using the Copenhagen interpretation and the

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Chatzidimitriou-Dreismann, C. Aris. "Experimental Implications of Negative Quantum Conditional Entropy—H2 Mobility in Nanoporous Materials." Applied Sciences 10, no. 22 (2020): 8266. http://dx.doi.org/10.3390/app10228266.

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During the last few decades, considerable advances in quantum information theory have shown deep existing connections between quantum correlation effects (like entanglement and quantum discord) and thermodynamics. Here the concept of conditional entropy plays a considerable role. In contrast to the classical case, quantum conditional entropy can take negative values. This counter-intuitive feature, already well understood in the context of information theory, was recently shown theoretically to also have a physical meaning in quantum thermodynamics [del Rio et al. Nature 2011, 474, 61]. Extend

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Krenn, Mario, Mehul Malik, Manuel Erhard, and Anton Zeilinger. "Orbital angular momentum of photons and the entanglement of Laguerre–Gaussian modes." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, no. 2087 (2017): 20150442. http://dx.doi.org/10.1098/rsta.2015.0442.

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The identification of orbital angular momentum (OAM) as a fundamental property of a beam of light nearly 25 years ago has led to an extensive body of research around this topic. The possibility that single photons can carry OAM has made this degree of freedom an ideal candidate for the investigation of complex quantum phenomena and their applications. Research in this direction has ranged from experiments on complex forms of quantum entanglement to the interaction between light and quantum states of matter. Furthermore, the use of OAM in quantum information has generated a lot of excitement, a

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ARRIGHI, PABLO. "QUANTUM DECOYS." International Journal of Quantum Information 02, no. 03 (2004): 341–51. http://dx.doi.org/10.1142/s0219749904000341.

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Alice communicates with words drawn uniformly amongst {|j>}j=1…n, the canonical orthonormal basis. Sometimes however, Alice interleaves quantum decoys [Formula: see text] between her messages. Such pairwise superpositions of possible words cannot be distinguished from the message words. Thus as malevolent Eve observes the quantum channel, she runs the risk of damaging the superpositions (by causing a collapse). At the receiving end honest Bob, whom we assume is warned of the quantum decoys' distribution, checks upon their integrity with a measurement. The present work establishes, in the ca

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Manzalini, Antonio. "Quantum Communications in Future Networks and Services." Quantum Reports 2, no. 1 (2020): 221–32. http://dx.doi.org/10.3390/quantum2010014.

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Over the last few years, we have witnessed an impressive growth of data traffic and a progressive Digital Transformation of Industry and Society: the deployment of the ultra-broadband and low latency network infrastructures (e.g., 5G) are leading to a global digitalization of several domains. These techno-economic trends are expected to continue and even accelerate in the next decade, at end of which, 6G and smart networks and services will be exploited. Innovation will continue to drive the global economy into the next decade. This paper draws some technology trends and applications scenarios

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Huang, Zixin, Peter P. Rohde, Dominic W. Berry, Pieter Kok, Jonathan P. Dowling, and Cosmo Lupo. "Photonic quantum data locking." Quantum 5 (April 28, 2021): 447. http://dx.doi.org/10.22331/q-2021-04-28-447.

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Quantum data locking is a quantum phenomenon that allows us to encrypt a long message with a small secret key with information-theoretic security. This is in sharp contrast with classical information theory where, according to Shannon, the secret key needs to be at least as long as the message. Here we explore photonic architectures for quantum data locking, where information is encoded in multi-photon states and processed using multi-mode linear optics and photo-detection, with the goal of extending an initial secret key into a longer one. The secret key consumption depends on the number of m

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Bouchard, Frédéric, Felix Hufnagel, Dominik Koutný, et al. "Quantum process tomography of a high-dimensional quantum communication channel." Quantum 3 (May 6, 2019): 138. http://dx.doi.org/10.22331/q-2019-05-06-138.

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The characterization of quantum processes, e.g. communication channels, is an essential ingredient for establishing quantum information systems. For quantum key distribution protocols, the amount of overall noise in the channel determines the rate at which secret bits are distributed between authorized partners. In particular, tomographic protocols allow for the full reconstruction, and thus characterization, of the channel. Here, we perform quantum process tomography of high-dimensional quantum communication channels with dimensions ranging from 2 to 5. We can thus explicitly demonstrate the

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SINGH, T. P., and CENALO VAZ. "THE QUANTUM GRAVITATIONAL BLACK HOLE IS NEITHER BLACK NOR WHITE." International Journal of Modern Physics D 13, no. 10 (2004): 2369–73. http://dx.doi.org/10.1142/s0218271804006504.

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Understanding the end state of black hole evaporation, the microscopic origin of black hole entropy, the information loss paradox, and the nature of the singularity arising in gravitational collapse — these are outstanding challenges for any candidate quantum theory of gravity. Recently, a midisuperspace model of quantum gravitational collapse has been solved using a lattice regularization scheme. It is shown that the mass of an eternal black hole follows the Bekenstein spectrum, and a related argument provides a fairly accurate estimate of the entropy. The solution also describes a quantized

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SHALYT-MARGOLIN, A. E. "NON-UNITARY AND UNITARY TRANSITIONS IN GENERALIZED QUANTUM MECHANICS, NEW SMALL PARAMETER AND INFORMATION PROBLEM SOLVING." Modern Physics Letters A 19, no. 05 (2004): 391–403. http://dx.doi.org/10.1142/s0217732304013155.

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Quantum Mechanics of the Early Universe is considered as deformation of a well-known Quantum Mechanics. Similar to previous works of the author, the principal approach is based on deformation of the density matrix with concurrent development of the wave function deformation in the respective Schrödinger picture, the associated deformation parameter being interpreted as a new small parameter. It is demonstrated that the existence of black holes in the suggested approach in the end twice causes non-unitary transitions resulting in the unitarity. In parallel this problem is considered in other te

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Man'ko, V. I., and L. A. Markovich. "New Minkowski type inequalities and entropic inequalities for quantum states of qudits." International Journal of Quantum Information 12, no. 07n08 (2014): 1560021. http://dx.doi.org/10.1142/s0219749915600217.

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The two-parameter Minkowski like inequality written for composite quantum system state is obtained for arbitrary Hermitian non-negative matrix with trace equal to unity. The inequality can be used as entropic and information inequality for density matrix of noncomposite finite quantum system, e.g. for a single qudit state. The analogs of strong subadditivity condition for the single qudit is discussed in context of obtained Minkowski like inequality.

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Lozada Aguilar, Miguel Ángel, Andrei Khrennikov, and Klaudia Oleschko. "From axiomatics of quantum probability to modelling geological uncertainty and management of intelligent hydrocarbon reservoirs with the theory of open quantum systems." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 376, no. 2118 (2018): 20170225. http://dx.doi.org/10.1098/rsta.2017.0225.

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As was recently shown by the authors, quantum probability theory can be used for the modelling of the process of decision-making (e.g. probabilistic risk analysis) for macroscopic geophysical structures such as hydrocarbon reservoirs. This approach can be considered as a geophysical realization of Hilbert's programme on axiomatization of statistical models in physics (the famous sixth Hilbert problem). In this conceptual paper , we continue development of this approach to decision-making under uncertainty which is generated by complexity, variability, heterogeneity, anisotropy, as well as the

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Touil, Akram, Kevin Weber, and Sebastian Deffner. "Quantum Euler Relation for Local Measurements." Entropy 23, no. 7 (2021): 889. http://dx.doi.org/10.3390/e23070889.

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In classical thermodynamics the Euler relation is an expression for the internal energy as a sum of the products of canonical pairs of extensive and intensive variables. For quantum systems the situation is more intricate, since one has to account for the effects of the measurement back action. To this end, we derive a quantum analog of the Euler relation, which is governed by the information retrieved by local quantum measurements. The validity of the relation is demonstrated for the collective dissipation model, where we find that thermodynamic behavior is exhibited in the weak-coupling regi

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BERGHE, FREDERIK VANDEN, and THOMAS DURT. "WIGNER TOMOGRAPHIC QKD IN DIMENSION STRICTLY LARGER THAN 2." International Journal of Quantum Information 09, no. 05 (2011): 1185–208. http://dx.doi.org/10.1142/s0219749911008039.

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Traditionally, quantum information is formulated and implemented in terms of elementary quantum systems e.g. qubits. Now, it has been shown that certain appealing properties of entangled systems, like for instance nonlocality, are more robust against noise when they are realized at the level of higher dimensional systems, like qutrits (or more generally qudits with d strictly larger than 2). It has also been shown, in the case of the generalized Ekert protocol, (a so-called entanglement-based protocol) that confidentiality is enhanced when Quantum Key Distribution is realized with carriers of

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Huang, Lu, Hong Yu, Ran Li, Xiang Jun Li, and Jun Gu. "An Improved EEG Feature Extraction Method Based on Quantum Particle Swarm Optimizer Algorithm." Advanced Materials Research 694-697 (May 2013): 2526–29. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.2526.

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Feature extraction is a very important step in P300based brain-computer interface(BCI). Aiming at the large amount ofelectroencephalogram(EEG) data used in BCI, a method which combined quantum particleswarm optimizer(QPSO) algorithm with independent component analysis(ICA) technique was putforward for P300 extraction.It initialized several particles in the feasible domain of de-mixing matrixw, making them parallel search, andfinally reached the global convergence by the information communication betweenthe current particle and the global optimum particle. The method also optimizedthe search st

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Spedalieri, Gaetana, Carlo Ottaviani, and Stefano Pirandola. "Covariance Matrices under Bell-like Detections." Open Systems & Information Dynamics 20, no. 02 (2013): 1350011. http://dx.doi.org/10.1142/s123016121350011x.

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We derive a simple formula for the transformation of an arbitrary covariance matrix of (n + 2) bosonic modes under general Bell-like detections, where the last two modes are combined in an arbitrary beam splitter (i.e., with arbitrary transmissivity) and then homodyned. In particular, we consider the realistic condition of non-unit quantum efficiency for the homodyne detectors. This formula can easily be specialized to describe the standard Bell measurement and the heterodyne detection, which are exploited in many contexts, including protocols of quantum teleportation, entanglement swapping an

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KHRENNIKOV, ANDREI. "QUANTUM CORRELATIONS FROM CLASSICAL GAUSSIAN RANDOM VARIABLES: FUNDAMENTAL ROLE OF VACUUM NOISE." Fluctuation and Noise Letters 09, no. 04 (2010): 331–41. http://dx.doi.org/10.1142/s0219477510000265.

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We show that, in spite of rather common opinion, correlations of observables on subsystems of a composite quantum system can be represented as correlations of classical Gaussian variables. We restrict our model to the finite dimensional case (which is important, e.g., in quantum information theory). Here quantum correlations are represented by integrals with Gaussian densities which can be directly calculated. In particular, the EPR–Bell correlations for polarizations of entangled photons can be represented as correlations of Gaussian random variables. The tricky point of our construction is t

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Diazdelacruz, Jose. "Entropy Distribution in a Quantum Informational Circuit of Tunable Szilard Engines." Entropy 21, no. 10 (2019): 980. http://dx.doi.org/10.3390/e21100980.

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This paper explores the possibility of extending the existing model of a single-particle Quantum Szilard Engine to take advantage of some features of quantum information for driving typical mechanical systems. It focuses on devices that output mechanical work, extracting energy from a single thermal reservoir at the cost of increasing the entropy of a qubit; the reverse process is also considered. In this alternative, several engines may share the information carried by the same qubit, although its interception will prove completely worthless for any illegitimate user. To this end, multi-parti

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Pekola, J. P., and I. M. Khaymovich. "Thermodynamics in Single-Electron Circuits and Superconducting Qubits." Annual Review of Condensed Matter Physics 10, no. 1 (2019): 193–212. http://dx.doi.org/10.1146/annurev-conmatphys-033117-054120.

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Classical and quantum electronic circuits provide ideal platforms to investigate stochastic thermodynamics, and they have served as a stepping stone to realize Maxwell's Demons with highly controllable protocols. In this article, we first review the central thermal phenomena in quantum nanostructures. Thermometry and basic refrigeration methods are described as enabling tools for thermodynamics experiments. Next, we discuss the role of information in thermodynamics that leads to the concept of Maxwell's Demon. Various Maxwell's Demons realized in single-electron circuits over the past couple o

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Kang, Tong. "The Current Status of EMG Signals on Kinematics Needed for Precise Online Myoelectric Control and the Development Direction." E3S Web of Conferences 271 (2021): 01029. http://dx.doi.org/10.1051/e3sconf/202127101029.

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Widely accepted idea is the prosthetic control problem could be regarded as the pattern recognition problem. The prosthetic control means there are several differences such as distinguishable electric signals between different activation of muscle. However, this conventional method could not provide proper control of the artificial limbs. Kinematics behavior is continuous and needs the coordination of multiple physiological degrees of freedom (DOF) among various joints. Currently, a huge challenge is achieving precise, coherent and elegant coordination protheses which needs many DOFs to rehabi

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Ventegodt, Søren, Tyge Dahl Hermansen, Trine Flensborg-Madsen, Maj Lyck Nielsen, and Joav Merrick. "Human Development VIII: A Theory of Deep Quantum Chemistry and Cell Consciousness: Quantum Chemistry Controls Genes and Biochemistry to Give Cells and Higher Organisms Consciousness and Complex Behavior." Scientific World JOURNAL 6 (2006): 1441–53. http://dx.doi.org/10.1100/tsw.2006.257.

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Deep quantum chemistry is a theory of deeply structured quantum fields carrying the biological information of the cell, making it able to remember, intend, represent the inner and outer world for comparison, understand what it “sees”, and make choices on its structure, form, behavior and division. We suggest that deep quantum chemistry gives the cell consciousness and all the qualities and abilities related to consciousness. We use geometric symbolism, which is a pre-mathematical and philosophical approach to problems that cannot yet be handled mathematically. Using Occams razor we have start

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HOGG, TAD, PAVITHRA HARSHA, and KAY-YUT CHEN. "QUANTUM AUCTIONS." International Journal of Quantum Information 05, no. 05 (2007): 751–80. http://dx.doi.org/10.1142/s0219749907003183.

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We present a quantum auction protocol using superpositions to represent bids and distributed search to identify the winner(s). Measuring the final quantum state gives the auction outcome while simultaneously destroying the superposition. Thus, non-winning bids are never revealed. Participants can use entanglement to arrange for correlations among their bids, with the assurance that this entanglement is not observable by others. This protocol is useful for information hiding applications, such as partnership bidding with allocative externality or concerns about revealing bidding preferences. Th

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Amazioug, M., L. Jebli, M. Nassik, and N. Habiballah. "Dynamics of classical-quantum correlations between two movable mirrors in optomechanics." International Journal of Modern Physics B 34, no. 08 (2020): 2050066. http://dx.doi.org/10.1142/s0217979220500666.

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We study the dynamics of classical-quantum correlations in the nonadiabatic regime, using the rotating wave approximation (RWA), between two movable mirrors of two spatially separated Fabry–Pérot cavities, each of the two cavities having a movable end-mirror and coupled to a two-mode squeezed light from spontaneous parametric down-conversion. This work completes our previous work [M. Amazioug, M. Nassik and N. Habiballah, Eur. Phys. J. D 72, 171 (2018)] where we have studied the transfer of quantum correlations in steady state. The Bures distance is used to quantify the amount of entanglement

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Rani, P. Mercy Nesa, and Kamalika Datta. "Improved Ternary Reversible Logic Synthesis Using Group Theoretic Approach." Journal of Circuits, Systems and Computers 29, no. 12 (2020): 2050192. http://dx.doi.org/10.1142/s0218126620501923.

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Quantum computation relies on exploiting quantum mechanical phenomena, and has received significant attention in recent years. Higher-dimensional quantum systems increase the density of encoded information per computing element (e.g., qutrit for three-level system), resulting in less resource overhead. For instance, 63% reduction in the number of qutrits is possible for ternary quantum systems as compared to the corresponding binary systems. The proposed work exploits this fact to synthesize ternary reversible circuits employing a cycle-based technique. The method starts from the ternary rever

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Cartwright, Julyan H. E., and Alan L. Mackay. "Beyond crystals: the dialectic of materials and information." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, no. 1969 (2012): 2807–22. http://dx.doi.org/10.1098/rsta.2012.0106.

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We argue for a convergence of crystallography, materials science and biology, that will come about through asking materials questions about biology and biological questions about materials, illuminated by considerations of information. The complex structures now being studied in biology and produced in nanotechnology have outstripped the framework of classical crystallography, and a variety of organizing concepts are now taking shape into a more modern and dynamic science of structure, form and function. Absolute stability and equilibrium are replaced by metastable structures existing in a flu

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McKemmish, Laura K., David J. Kedziora, Graham R. White, Noel S. Hush, and Jeffrey R. Reimers. "Frequency-based Quantum Computers from a Chemist's Perspective." Australian Journal of Chemistry 65, no. 5 (2012): 512. http://dx.doi.org/10.1071/ch12053.

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Quantum computer elements are often designed and tested using molecular or nanoscopic components that form registers of qubits in which memory is stored and information processed. Often such registers are probed and manipulated using frequency-based techniques such as nuclear-magnetic resonance spectroscopy. A major challenge is to design molecules to act as these registers. We provide a basis for rational molecular design through consideration of the generic spectroscopic properties required for quantum computing, bypassing the need for intricate knowledge of the way these molecules are used

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Miller, Warner A. "Efficient photon sorter in a high-dimensional state space." Quantum Information and Computation 11, no. 3&4 (2011): 313–25. http://dx.doi.org/10.26421/qic11.3-4-9.

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An increase in the dimension of state space for quantum key distribution (QKD) can decrease its fidelity requirements while also increasing its bandwidth. A significant obstacle for QKD with qu$d$its ($d\geq 3$) has been an efficient and practical quantum state sorter for photons whose complex fields are modulated in both amplitude and phase. We propose such a sorter based on a multiplexed thick hologram, constructed e.g. from photo-thermal refractive (PTR) glass. We validate this approach using coupled-mode theory with parameters consistent with PTR glass to simulate a holographic sorter. The

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Simeoni, Ricardo. "A New Approach to High-Order Electroencephalogram Phase Analysis Details the Mathematical Mechanisms of Central Nervous System Impulse Encoding." UNET JOSS: Journal of Science and Society 1, no. 1 (2021): 1–34. http://dx.doi.org/10.52042/unetjoss010101.

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This paper presents a new electroencephalogram (EEG) analysis technique which is applied to example EEGs pertaining to nine human subjects and a broad spectrum of clinical scenarios. While focusing on technique physical efficacy, the paper also paves the way for future clinically-focused studies with revelations of several quantified and detailed findings in relation to high-order central nervous system communicative impulse encoding akin to a sophisticated form of phase-shift keying. The fact that fine encoding details are extracted with confidence from a seemingly modest EEG set supports the

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Gong, Su-Hyun, Je-Hyung Kim, Young-Ho Ko, et al. "Self-aligned deterministic coupling of single quantum emitter to nanofocused plasmonic modes." Proceedings of the National Academy of Sciences 112, no. 17 (2015): 5280–85. http://dx.doi.org/10.1073/pnas.1418049112.

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The quantum plasmonics field has emerged and been growing increasingly, including study of single emitter–light coupling using plasmonic system and scalable quantum plasmonic circuit. This offers opportunity for the quantum control of light with compact device footprint. However, coupling of a single emitter to highly localized plasmonic mode with nanoscale precision remains an important challenge. Today, the spatial overlap between metallic structure and single emitter mostly relies either on chance or on advanced nanopositioning control. Here, we demonstrate deterministic coupling between th

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