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Quantum Discord: A Measure of the Quantumness of Correlations [PDF]
Physical Review Letters, 2001 Two classically identical expressions for the mutual information generally differ when the systems involved are quantum. This difference defines the quantum discord. It can be used as a measure of the quantumness of correlations. Separability of the density matrix describing a pair of systems does not guarantee vanishing of the discord, thus showing ...
H Ollivier, Wojciech H. Zurek
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Quantum discord and multipartite correlations [PDF]
EPL (Europhysics Letters), 2011 Recently, it was realized that quantum discord can be seen as the minimal amount of correlations which are lost when some local quantum operations are performed.
Okrasa, Małgorzata, Walczak, Zbigniew
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The freezing Rènyi quantum discord. [PDF]
Sci Rep, 2019 AbstractAs a universal quantum character of quantum correlation, the freezing phenomenon is researched by geometry and quantum discord methods, respectively. In this paper, the properties of Rènyi discord is studied for two independent Dimer System coupled to two correlated Fermi-spin environments under the non-Markovian condition.
Li XY +5 more
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Quantum discord as a resource for quantum cryptography. [PDF]
Sci Rep, 2014 Quantum discord is the minimal bipartite resource which is needed for a secure quantum key distribution, being a cryptographic primitive equivalent to non-orthogonality. Its role becomes crucial in device-dependent quantum cryptography, where the presence of preparation and detection noise (inaccessible to all parties) may be so strong to prevent the ...
Pirandola S.
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Monogamy of quantum discord [PDF]
Quantum Science and Technology, 2021 The original quantum discord (QD) is shown to be not monogamous except for the three-qubit states. Recently, a complete monogamy relation for multiparty quantum system was established for entanglement in [Phys. Rev. A. {101}, 032301~(2020)], and in addition, a new multipartite generalization of QD was proposed in [Phys. Rev. Lett. {124}, 110401~(2020)].
Yu Guo, Lizhong Huang, Yang Zhang
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Efficient Characterization of Quantum Evolutions via a Recommender System [PDF]
Quantum, 2021 We demonstrate characterizing quantum evolutions via matrix factorization algorithm, a particular type of the recommender system (RS). A system undergoing a quantum evolution can be characterized in several ways.
Priya Batra +2 more
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Topology of quantum discord [PDF]
Journal of Physics A: Mathematical and Theoretical, 2013 Revised version submitted to Physical Review ...
Nga T. T. Nguyen, Robert Joynt
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Quantum discord in quantum computation [PDF]
Journal of Physics: Conference Series, 2011 Prepared for publication in the Proceedings of DICE2010. Section 4 contains previously unpublished results on process tomography.
Daniel R. Terno +3 more
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Monogamy properties of quantum correlations in neutrino oscillations
European Physical Journal C: Particles and Fields, 2023 The monogamy relation of quantum states has limited the shareability properties of quantum resources in multiparty quantum systems. It plays a vital role in information distribution and transformation over many sites in quantum communications.
Guang-Jie Wang +4 more
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Quantum Discord for d⊗2 Systems. [PDF]
Sci Rep, 2015 AbstractWe present an analytical solution for classical correlation, defined in terms of linear entropy, in an arbitrary "Equation missing" system when the second subsystem is measured. We show that the optimal measurements used in the maximization of the classical correlation in terms of linear entropy, when used to calculate the quantum discord in ...
Ma Z, Chen Z, Fanchini FF, Fei SM.
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