Phase sensitivity approaching the quantum Cramér-Rao bound in a modified SU(1,1) interferometer

Jian-Dong Zhang, Chenglong You, Chuang Li, Shuai Wang
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引用次数: 6

Abstract

SU(1,1) interferometers, based on the usage of nonlinear elements, are superior to passive interferometers in phase sensitivity. However, the SU(1,1) interferometer cannot make full use of photons carrying phase information as the second nonlinear element annihilates some of the photons inside. Here, we focus on improving phase sensitivity and propose a new protocol based on a modified SU(1,1) interferometer, where the second nonlinear element is replaced by a beam splitter. We utilize two coherent states as inputs and implement balanced homodyne measurement at the output. Our analysis suggests that the protocol we propose can achieve sub-shot-noise-limited phase sensitivity and is robust against photon loss and background noise. Our work is important for practical quantum metrology using SU(1,1) interferometers.
改进SU(1,1)干涉仪中接近量子cram - rao界的相位灵敏度
基于非线性元件的SU(1,1)干涉仪在相位灵敏度上优于无源干涉仪。然而,SU(1,1)干涉仪不能充分利用携带相位信息的光子,因为第二非线性元件会湮灭其中的一些光子。在此,我们着重于提高相位灵敏度,并提出了一种基于改进SU(1,1)干涉仪的新协议,其中第二非线性元件由分束器取代。我们利用两个相干态作为输入,并在输出处实现平衡同差测量。我们的分析表明,我们提出的协议可以实现亚短噪声限制的相位灵敏度,并且对光子损失和背景噪声具有鲁棒性。本文的工作对实际使用SU(1,1)干涉仪进行量子计量具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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