Experimental characterization of continuous-variable entanglement

被引：86

作者：

Bowen, WP ^{[1
]}

Schnabel, R

Lam, PK

Ralph, TC

机构：

[1] Australian Natl Univ, Fac Sci, Dept Phys, Canberra, ACT 0200, Australia

[2] Univ Queensland, Dept Phys, St Lucia, Qld 4072, Australia

来源：

PHYSICAL REVIEW A | 2004年 / 69卷 / 01期

关键词：

D O I：

10.1103/PhysRevA.69.012304

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present an experimental analysis of quadrature entanglement produced from a pair of amplitude squeezed beams. The correlation matrix of the state is characterized within a set of reasonable assumptions, and the strength of the entanglement is gauged using measures of the degree of inseparability and the degree of Einstein-Podolsky-Rosen (EPR) paradox. We introduce controlled decoherence in the form of optical loss to the entangled state, and demonstrate qualitative differences in the response of the degrees of inseparability and EPR paradox to this loss. The entanglement is represented on a photon number diagram that provides an intuitive and physically relevant description of the state. We calculate efficacy contours for several quantum information protocols on this diagram, and use them to predict the effectiveness of our entanglement in those protocols.

引用

页数：17

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