标题： 使用光的非高斯量子态进行相位偏移的高保真度检测 显示英文标题

标题： High-fidelity detection of a phase shift using non-Gaussian quantum states of light

摘要： 我们表明，通过将制备在非高斯量子态的光脉冲注入到双臂干涉仪的暗端口，可以检测给定的相位偏移，其保真度仅受光学损耗和光探测效率的限制。 相位偏移的值与注入到干涉仪另一(亮)端口的经典载波光的幅度成反比。 可以通过在输入暗端口使用额外的简并参量放大器(压缩器)和在输出暗端口使用匹配的反压缩器来减少该值。 我们表明，使用现代高效率的光子数分辨探测器，与普通(高斯态)干涉仪相比，可以将检测误差降低一个数量级。 显示英文摘要

摘要： We show that by injecting a light pulse prepared in a non-Gaussian quantum state into the dark port of a two-arm interferometer, it is possible to detect a given phase shift with the fidelity which is limited only by the optical losses and the photodetection inefficiency. The value of the phase shift is inversely proportional to the amplitude of the classical carrier light injected into another (bright) port of the interferometer. It can be reduced by using an additional degenerate parametric amplifier (squeezer) in the input dark port and the matching anti-squeezer in the output dark port. We show that using the modern high-efficiency photon number resolving detectors, it is possible to reduce the detection error by almost one order of magnitude in comparison with the ordinary (Gaussian-state) interferometry.