Generation of bright two-color continuous variable entanglement

被引：201

作者：

Villar, AS ^{[1
]}

Cruz, LS ^{[1
]}

Cassemiro, KN ^{[1
]}

Martinelli, M ^{[1
]}

Nussenzveig, P ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.95.243603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present the first measurement of squeezed-state entanglement between the twin beams produced in an optical parametric oscillator operating above threshold. In addition to the usual squeezing in the intensity difference between the twin beams, we have measured squeezing in the sum of phase quadratures. Our scheme enables us to measure such phase anticorrelations between fields of different frequencies. In the present measurements, wavelengths differ by approximate to 1 nm. Entanglement is demonstrated according to the Duan et al. criterion [Phys. Rev. Lett. 84, 2722 (2000)] Delta(2)p<^>(-)+Delta(2)q<^>(+)=1.41(2)< 2. This experiment opens the way for new potential applications such as the transfer of quantum information between different parts of the electromagnetic spectrum.

引用

页数：4

共 28 条

[1] Observation of three-photon Greenberger-Horne-Zeilinger entanglement [J].

Bouwmeester, D ;

Pan, JW ;

Daniell, M ;

Weinfurter, H ;

Zeilinger, A .

PHYSICAL REVIEW LETTERS, 1999, 82 (07) :1345-1349

[2] Experimental investigation of criteria for continuous variable entanglement [J].

Bowen, WP ;

Schnabel, R ;

Lam, PK ;

Ralph, TC .

PHYSICAL REVIEW LETTERS, 2003, 90 (04)

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

Braunstein, SL ;

van Loock, P .

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

[4] Critical quantum fluctuations in the degenerate parametric oscillator [J].

Drummond, PD ;

Dechoum, K ;

Chaturvedi, S .

PHYSICAL REVIEW A, 2002, 65 (03) :8

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

Duan, LM ;

Giedke, G ;

Cirac, JI ;

Zoller, P .

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

[6] Quantum interference of ultrastable twin optical beams [J].

Feng, S ;

Pfister, O .

PHYSICAL REVIEW LETTERS, 2004, 92 (20) :203601-1

[7] Unconditional quantum teleportation [J].

Furusawa, A ;

Sorensen, JL ;

Braunstein, SL ;

Fuchs, CA ;

Kimble, HJ ;

Polzik, ES .

SCIENCE, 1998, 282 (5389) :706-709

[8] SYSTEM CONTROL BY VARIATION OF THE SQUEEZING PHASE [J].

GALATOLA, P ;

LUGIATO, LA ;

PORRECA, MG ;

TOMBESI, P ;

LEUCHS, G .

OPTICS COMMUNICATIONS, 1991, 85 (01) :95-103

[9] Bulk spin-resonance quantum computation [J].

Gershenfeld, NA ;

Chuang, IL .

SCIENCE, 1997, 275 (5298) :350-356

[10] Generation of Einstein-Podolsky-Rosen pairs of atoms [J].

Hagley, E ;

Maitre, X ;

Nogues, G ;

Wunderlich, C ;

Brune, M ;

Raimond, JM ;

Haroche, S .

PHYSICAL REVIEW LETTERS, 1997, 79 (01) :1-5

← 1 2 3 →