A two-step optimized measurement for the phase shift

被引：2
|
作者：
Chizhov, AV [1 ]
De Renzi, V
Paris, MGA
机构：
[1] Joint Inst Nucl Res, Bogolubov Lab Theoret Phys, Dubna 141980, Moscow Region, Russia
[2] Max Planck Gesell, Arbeitsgrp Nichtklassiche Strahlung, D-12489 Berlin, Germany
[3] Univ Modena, Dipartimento Fis, I-41100 Modena, Italy
[4] INFM, Unita Modena, I-41100 Modena, Italy
[5] Max Planck Gesell, Fritz Haber Inst, Chem Phys Abt, D-14195 Berlin, Germany
[6] Univ Pavia, Dipartimento Fis Alessandro Volta, I-27100 Pavia, Italy
[7] INFM, Unita Pavia, I-27100 Pavia, Italy
来源：
PHYSICS LETTERS A | 1998年 / 237卷 / 4-5期
关键词：
D O I：
10.1016/S0375-9601(97)00852-9
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A two-step detection strategy is suggested for the precise measurement of the optical phase shift. In the first step an unsharp, but 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 appropriate squeezing of the probe made to obtain a sharp phase distribution. Application to squeezed states leads to a phase sensitivity scaling as Delta phi similar or equal to N-1 relative to the total number of photons impinged onto the apparatus. Numerical simulations of the whole detection strategy are also presented. (C) 1998 Published by Elsevier Science B.V.
引用
收藏
页码：201 / 205
页数：5
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