Entropy of phase measurement: Quantum phase via quadrature measurement

Details Entropy of phase measurement: Quantum phase via quadrature measurement Entropy of phase measurement: Quantum phase via quadrature measurement

1995-06-02

arxiv.org/abs/quant-ph/9506001v1

Physics

Quantum Physics

4 pages, Revtex, 2 figures .pcx uuencode

Scientific paper

10.1103/PhysRevA.53.3738

The content of phase information of an arbitrary phase--sensitive measurement is evaluated using the maximum likelihood estimation. The phase distribution is characterized by the relative entropy--a nonlinear functional of input quantum state. As an explicit example the multiple measurement of quadrature operator is interpreted as quantum phase detection achieving the ultimate resolution predicted by the Fisher information.

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