منابع مشابه
Review of quantum discord in bipartite and multipartite systems
Quantum information and computation, based on quantum correlations of quantum systems, is one of the promising new fields of physics and information science. Entanglement is the key resource of quantum information processing. However, it is shown recently that quantum entanglement is not the only kind of quantum correlations useful for quantum information processing. Quantum systems without any...
متن کاملQuantum discord in quantum computation
Quantum discord is a measure of the quantumness of correlations. After reviewing its different versions and properties, we apply it to the questions of quantum information processing. First we show that changes in discord in the processed unentangled states indicate the need for entanglement in the distributed implementation of quantum gates. On the other hand, it was shown that zero system-env...
متن کاملGaussian quantum discord.
We extend the quantum discord to continuous variable systems and evaluate Gaussian quantum discord C(ϱ) for bipartite Gaussian states. In particular, for squeezed-thermal states, we explicitly maximize the extractable information over Gaussian measurements: C(ϱ) is minimized by a generalized measurement rather than a projective one. Almost all squeezed-thermal states have nonzero Gaussian disco...
متن کاملOperational interpretations of quantum discord
D. Cavalcanti,1 L. Aolita,2 S. Boixo,3 K. Modi,1 M. Piani,4 and A. Winter1,5 1Centre for Quantum Technologies, National University of Singapore, Singapore 117542 2ICFO-Institut de Ciéncies Fotóniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain 3Institute for Quantum Information, California Institute of Technology, Pasadena, California 91125, USA 4Institute for Quantum...
متن کاملStochastic resonance of quantum discord
Chee Kong Lee,1,* Leong Chuan Kwek,1,2 and Jianshu Cao3 1Centre for Quantum Technologies, National University of Singapore, 117543 Singapore 2National Institute of Education and Institute of Advanced Studies, Nanyang Technological University, 637616 Singapore 3Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA (Received 7 August 2011; published 1...
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ژورنال
عنوان ژورنال: JETP Letters
سال: 2011
ISSN: 0021-3640,1090-6487
DOI: 10.1134/s0021364011080054