Advancement of estimation fidelity in continuous quantum measurement

Details Advancement of estimation fidelity in continuous quantum measurement Advancement of estimation fidelity in continuous quantum measurement

2002-02-09

arxiv.org/abs/quant-ph/0202052v1

J.Phys. A35 (2002) 2867-2875

Physics

Quantum Physics

12 pp LaTeX

Scientific paper

10.1088/0305-4470/35/12/311

We estimate an unknown qubit from the long sequence of n random polarization measurements of precision Delta. Using the standard Ito-stochastic equations of the aposteriori state in the continuous measurement limit we calculate the advancement of fidelity. We show that the standard optimum value 2/3 is achieved asymptotically for n >> Delta^2 / 96 >> 1. We append a brief derivation of novel Ito-equations for the estimate state.

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