Experimental characterization of continuous-variable entanglement

Bowen, W. P., Schnabel, R., Lam, P. K. and Ralph, T. C. (2004) Experimental characterization of continuous-variable entanglement. Physical Review A, 69 1: 012304-1-012304-17. doi:10.1103/PhysRevA.69.012304

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Author Bowen, W. P.
Schnabel, R.
Lam, P. K.
Ralph, T. C.
Title Experimental characterization of continuous-variable entanglement
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2004
Sub-type Article (original research)
DOI 10.1103/PhysRevA.69.012304
Open Access Status File (Publisher version)
Volume 69
Issue 1
Start page 012304-1
End page 012304-17
Total pages 17
Editor Crasemann, B.
Place of publication New York
Publisher American Physical Society
Collection year 2004
Language eng
Subject C1
240301 Atomic and Molecular Physics
780102 Physical sciences
02 Physical Sciences
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract 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.
Keyword Optics
Physics, Atomic, Molecular & Chemical
Podolsky-rosen Paradox
Nondegenerate Parametric Amplification
Separability Criterion
Quantum Teleportation
Q-Index Code C1
Additional Notes Physical Review A, 69, 012304

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Created: Wed, 15 Aug 2007, 04:24:32 EST