A new type of quantum interferometer was recently realized that employs parametric amplifiers (PAs) as the wave splitting and mixing elements. The quantum behavior stems from the PAs, which produce quantum entangled fields for probing the phase change signal in the interferometer. This type of quantum entangled interferometer exhibits some unique properties that are different from traditional beam splitter-based interferometers such as Mach–Zehnder interferometers. Because of these properties, it is superior to the traditional interferometers in many aspects, especially in the phase measurement sensitivity. We will review its unique properties and applications in quantum metrology and sensing, quantum information, and quantum state engineering.

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Quantum SU（1,1）干涉仪：基本原理和应用

最近实现了一种新型的量子干涉仪，它采用参量放大器（PA）作为波分离和混频元件。量子行为源自PA，PA产生量子纠缠场以探测干涉仪中的相变信号。这种类型的量子纠缠干涉仪具有一些独特的特性，这些特性与传统的基于分束器的干涉仪（例如Mach–Zehnder干涉仪）不同。由于这些特性，它在很多方面都优于传统的干涉仪，尤其是在相位测量灵敏度方面。我们将回顾其在量子计量和传感，量子信息和量子态工程中的独特性质和应用。