Detection of continuous variable entanglement without coherent local oscillators

被引：39

作者：

Ferris, Andrew J. ^{[1
]}

Olsen, Murray K. ^{[1
]}

Cavalcanti, Eric G. ^{[1
,2
]}

Davis, Matthew J. ^{[1
]}

机构：

[1] Univ Queensland, Sch Phys Sci, ARC Ctr Excellence Quantum Atom Opt, Brisbane, Qld 4072, Australia

[2] Griffith Univ, Ctr Quantum Dynam, Nathan, Qld 4111, Australia

来源：

PHYSICAL REVIEW A | 2008年 / 78卷 / 06期

基金：

澳大利亚研究理事会;

关键词：

Bose-Einstein condensation; quantum entanglement; quantum optics;

D O I：

10.1103/PhysRevA.78.060104

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We propose three criteria for identifying continuous variable entanglement between two many-particle systems with no restrictions on the quantum state of the local oscillators used in the measurements. Mistakenly asserting a coherent state for the local oscillator can lead to incorrectly identifying the presence of entanglement. We demonstrate this in simulations with 100 particles and also find that large number fluctuations do not prevent the observation of entanglement. Our results are important for quantum information experiments with realistic Bose-Einstein condensates or in optics with arbitrary photon states.

引用

页数：4

共 34 条

[1] Experimental investigation of continuous-variable quantum teleportation [J].

Bowen, WP ;

Treps, N ;

Buchler, BC ;

Schnabel, R ;

Ralph, TC ;

Bachor, HA ;

Symul, T ;

Lam, PK .

PHYSICAL REVIEW A, 2003, 67 (03)

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

Braunstein, SL ;

van Loock, P .

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

[3] Parametric amplification of scattered atom pairs [J].

Campbell, GK ;

Mun, J ;

Boyd, M ;

Streed, EW ;

Ketterle, W ;

Pritchard, DE .

PHYSICAL REVIEW LETTERS, 2006, 96 (02)

[4]

CAVALCANTI EG, UNPUB

[5] Direct observation of sub-poissonian number statistics in a degenerate bose gas [J].

Chuu, CS ;

Schreck, F ;

Meyrath, TP ;

Hanssen, JL ;

Price, GN ;

Raizen, MG .

PHYSICAL REVIEW LETTERS, 2005, 95 (26)

[6] Bose-Einstein condensates relative phase measurements through atomic homodyne detection [J].

da Cunha, B. R. ;

de Oliveira, M. C. .

PHYSICAL REVIEW A, 2007, 75 (06)

[7] Teleportation of a Bose-Einstein condensate state by controlled elastic collisions [J].

de Oliveira, MC .

PHYSICAL REVIEW A, 2003, 67 (02) :7

[8] Inseparability criterion for continuous variable systems [J].

Duan, LM ;

Giedke, G ;

Cirac, JI ;

Zoller, P .

PHYSICAL REVIEW LETTERS, 2000, 84 (12) :2722-2725

[9] Can quantum-mechanical description of physical reality be considered complete? [J].

Einstein, A ;

Podolsky, B ;

Rosen, N .

PHYSICAL REVIEW, 1935, 47 (10) :0777-0780

[10]

*EPAPS, EPLRAAN78R19812 EPAP, P31602

← 1 2 3 4 →