Physics – Quantum Physics
Scientific paper
2003-08-31
Phys. Rev. A 69, 012304 (2004)
Physics
Quantum Physics
17 pages, 15 figures, published with minor changes
Scientific paper
10.1103/PhysRevA.69.012304
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 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.
Bowen Warwick P.
Lam Ping Koy
Ralph Timothy C.
Schnabel Roman
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