Quantum nature of Gaussian discord: Experimental evidence and role of system-environment correlations

被引：14

作者：

Chille, Vanessa ^{[1
,2
]}

Quinn, Niall ^{[3
]}

Peuntinger, Christian ^{[1
,2
]}

Croal, Callum ^{[3
]}

Mista, Ladislav, Jr. ^{[4
]}

Marquardt, Christoph ^{[1
,2
]}

Leuchs, Gerd ^{[1
,2
]}

Korolkova, Natalia ^{[3
]}

机构：

[1] Max Planck Inst Sci Light, Erlangen, Germany

[2] Univ Erlangen Nurnberg, Inst Opt Informat & Photon, D-91054 Erlangen, Germany

[3] Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

[4] Palacky Univ, Dept Opt, Olomouc 77146, Czech Republic

来源：

PHYSICAL REVIEW A | 2015年 / 91卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

CRITERION; STATES;

D O I：

10.1103/PhysRevA.91.050301

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We provide experimental evidence of quantum features in bipartite states classified as entirely classical according to a conventional criterion based on the Glauber P function but possessing nonzero Gaussian quantum discord. Their quantum nature is experimentally revealed by acting locally on one part of the discordant state. We experimentally verify and investigate the effect of discord increase under the action of local loss and link it to the entanglement with the environment. Adding an environmental system purifying the state, we unveil the flow of quantum correlations within a global pure system using the Koashi-Winter inequality. For a discordant state generated by splitting a state in which the initial squeezing is destroyed by random displacements, we demonstrate the recovery of entanglement highlighting the role of system-environment correlations.

引用

页数：6

共 42 条

[1] Gaussian measures of entanglement versus negativities: Ordering of two-mode Gaussian states [J].

Adesso, G ;

Illuminati, F .

PHYSICAL REVIEW A, 2005, 72 (03)

[2] Experimental Entanglement Activation from Discord in a Programmable Quantum Measurement [J].

Adesso, Gerardo ;

D'Ambrosio, Vincenzo ;

Nagali, Eleonora ;

Piani, Marco ;

Sciarrino, Fabio .

PHYSICAL REVIEW LETTERS, 2014, 112 (14)

[3] Quantum versus Classical Correlations in Gaussian States [J].

Adesso, Gerardo ;

Datta, Animesh .

PHYSICAL REVIEW LETTERS, 2010, 105 (03)

[4] Flow of quantum correlations from a two-qubit system to its environment [J].

Aguilar, G. H. ;

Farias, O. Jimenez ;

Valdes-Hernandez, A. ;

Ribeiro, P. H. Souto ;

Davidovich, L. ;

Walborn, S. P. .

PHYSICAL REVIEW A, 2014, 89 (02)

[5] Homodyne Estimation of Gaussian Quantum Discord [J].

Blandino, Remi ;

Genoni, Marco G. ;

Etesse, Jean ;

Barbieri, Marco ;

Paris, Matteo G. A. ;

Grangier, Philippe ;

Tualle-Brouri, Rosa .

PHYSICAL REVIEW LETTERS, 2012, 109 (18)

[6] Quantum information with continuous variables [J].

Braunstein, SL ;

van Loock, P .

REVIEWS OF MODERN PHYSICS, 2005, 77 (02) :513-577

[7] Propagation of nonclassical correlations across a quantum spin chain [J].

Campbell, S. ;

Apollaro, T. J. G. ;

Di Franco, C. ;

Banchi, L. ;

Cuccoli, A. ;

Vaia, R. ;

Plastina, F. ;

Paternostro, M. .

PHYSICAL REVIEW A, 2011, 84 (05)

[8] Local-channel-induced rise of quantum correlations in continuous-variable systems [J].

Ciccarello, Francesco ;

Giovannetti, Vittorio .

PHYSICAL REVIEW A, 2012, 85 (02)

[9] Creating quantum correlations through local nonunitary memoryless channels [J].

Ciccarello, Francesco ;

Giovannetti, Vittorio .

PHYSICAL REVIEW A, 2012, 85 (01)

[10] Separable states can be used to distribute entanglement -: art. no. 037902 [J].

Cubitt, TS ;

Verstraete, F ;

Dür, W ;

Cirac, JI .

PHYSICAL REVIEW LETTERS, 2003, 91 (03)

← 1 2 3 4 5 →