Homodyne Estimation of Gaussian Quantum Discord
نویسندگان
چکیده
منابع مشابه
Homodyne estimation of Gaussian quantum discord.
We address the experimental estimation of Gaussian quantum discord for a two-mode squeezed thermal state, and demonstrate a measurement scheme based on a pair of homodyne detectors assisted by Bayesian analysis, which provides nearly optimal estimation for small value of discord. In addition, though homodyne detection is not optimal for Gaussian discord, the noise ratio to the ultimate quantum ...
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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...
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Quantum discord quantifies quantum correlation between quantum systems, which has potential application in quantum information processing. In this paper, we propose a scheme realizing the remote transfer of Gaussian quantum discord, in which another quantum discordant state or an Einstein-Podolsky-Rosen entangled state serves as ancillary state. The calculation shows that two independent optica...
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Paolo Giorda,1 Michele Allegra,1,2,3 and Matteo G. A. Paris4,5 1Institute for Scientific Interchange Foundation (ISI), I-10126 Torino, Italy 2Dipartimento di Fisica, Università di Torino, I-10125 Torino, Italy 3INFN, Sezione di Torino, I-10125 Torino, Italy 4Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy 5CNISM, Unità di Milano, I-20133 Milano, Italy (Received 1...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2012
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.109.180402