A two-step optimized measurement for the phase-shift

Details A two-step optimized measurement for the phase-shift A two-step optimized measurement for the phase-shift

1998-01-29

arxiv.org/abs/quant-ph/9801067v1

Phys.Lett. A237 (1998) 201

Physics

Quantum Physics

Latex 5 figs -- More info at http://enterprise.pv.infn.it/~paris

Scientific paper

10.1016/S0375-9601(97)00852-9

A two-step detection strategy is suggested for the precise measurement of the optical phase-shift. In the first step an unsharp, however, unbiased joint measurement of the phase and photon number is performed by heterodyning the signal field. Information coming from this step is then used for suitable squeezing of the probe mode to obtain a sharp phase distribution. Application to squeezed states leads to a phase sensitivity scaling as $\Delta\phi\simeq N^{-1}$ relative to the total number of photons impinged into the apparatus. Numerical simulations of the whole detection strategy are also also presented.

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