论文标题
SU（2）-in-in-Su（1,1）嵌套干涉仪的量子密集计量学
Quantum dense metrology by an SU(2)-in-SU(1,1) nested interferometer
论文作者
论文摘要
借助量子纠缠，量子致密计量学（QDM）是一种可以执行两个共轭量的联合估计值，例如光场的相位和振幅调制，同时击败标准量子限制。 SU（1,1）干涉仪（SUI）可以实现具有检测损失耐受性的QDM，但绝对灵敏度受到限制。在这里，我们提出了一个QDM方案，其线性干涉仪（SU（2））嵌套在SU（1,1）干涉仪内。通过使用退化的SUI并控制SUI中相敏放大器的相角，我们可以实现相位和幅度调制任意混合物的测量精度中的最佳量子增强。
With the help of quantum entanglement, quantum dense metrology (QDM) is a technique that can perform the joint estimates of two conjugate quantities such as phase and amplitude modulations of an optical field with an accuracy beating the standard quantum limit simultaneously. SU(1,1) interferometers (SUI) can realize QDM with detection loss tolerance but is limited in absolute sensitivity. Here we present a QDM scheme with a linear interferometer (SU(2)) nested inside an SU(1,1) interferometer. By using a degenerate SUI and controlling the phase angle of the phase-sensitive amplifers in SUI, we can achieve the optimum quantum enhancement in the measurement precision of arbitrary mixture of phase and amplitude modulation.
