Results 11 to 20 of about 440,056 (266)
Quantum discords of tripartite quantum systems [PDF]
Quant. Inf. Process. (2022) 21:147, (17pp), 2022 The quantum discord of bipartite systems is one of the best-known measures of non-classical correlations and an important quantum resource. In the recent work appeared in [Phys. Rev. Lett 2020, 124:110401], the quantum discord has been generalized to multipartite systems.
Jianming Zhou, Xiaoli Hu, Naihuan Jing
arxiv +3 more sources
Contextuality and Quantum Discord [PDF]
Physics Letters A 449, 128347 (2022), 2022 One of the defining differences between classical and quantum systems is how measurements affect them. Here, we compare the approaches of contextuality and quantum discord in capturing quantum correlations in special classes of two-qubit states, demonstrating that although non-discordant states are non-contextual, discordant states are not always ...
arxiv +3 more sources
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.
europepmc +5 more sources
Discord and non-classicality in probabilistic theories [PDF]
Phys. Rev. Lett. 108, 120502 (2012), 2011 Quantum discord quantifies non-classical correlations in quantum states. We introduce discord for states in causal probabilistic theories, inspired by the original definition proposed in Ref. [17]. We show that the only probabilistic theory in which all states have null discord is classical probability theory.
D. M. Greenberger +4 more
arxiv +3 more sources
Gaussian quantum discord [PDF]
Phys. Rev. Lett. 105, 020503 (2010), 2010 We extend the quantum discord to continuous variable systems and evaluate Gaussian quantum discord C(\rho) for bipartite Gaussian states. In particular, for squeezed thermal states (STS), we explicitly maximize the extractable information over Gaussian measurements: C(\rho) is minimized by a generalized measurement rather than a projective one.
P. Giorda, M. Paris
arxiv +6 more sources
Quantum correlation in a nano-electro-optomechanical system enhanced by an optical parametric amplifier and Coulomb-type interaction [PDF]
Scientific Reports, 2023 In this paper, we investigated the quantum correlation of nano-electro-optomechanical system enhanced by an optical parametric amplifier (OPA) and Coulomb-type interaction. In particular, we consider a hybrid system consisting of a cavity and two charged
Habtamu Dagnaw Mekonnen +3 more
doaj +2 more sources
Quantum discord, local operations, and Maxwell’s demons [PDF]
Phys. Rev. A 81, 062103 (2010), 2010 Quantum discord was proposed as a measure of the "quantumness" of correlations. There are at least three different discord-like quantities, two of which determine the difference between the efficiencies of a Szilard's engine under different sets of restrictions. The three discord measures vanish simulataneosly. We introduce an easy way to test for zero
Aharon Brodutch, Daniel R. Terno
openalex +2 more sources
Revealing Tripartite Quantum Discord with Tripartite Information Diagram
Entropy, 2017 A new measure based on the tripartite information diagram is proposed for identifying quantum discord in tripartite systems. The proposed measure generalizes the mutual information underlying discord from bipartite to tripartite systems, and utilizes ...
Wei-Ting Lee, Che-Ming Li
doaj +4 more sources
A pedagogical overview of quantum discord [PDF]
Open Systems & Information Dynamics, 2013 Recent measures of nonclassical correlations are motivated by different notions of classicality and operational means. Quantum discord has received a great deal of attention in studies involving quantum computation, metrology, dynamics, many-body physics,
Modi, Kavan
core +4 more sources
Entanglement and quantum discord in the cavity QED models [PDF]
HeliyonWe investigate the quantum correlation between light and matter in bipartite quantum systems, drawing on the Jaynes–Cummings model and the Tavis–Cummings model, which are well-established in cavity quantum electrodynamics.
Hui-hui Miao, Wanshun Li
doaj +2 more sources