Many quantum radars currently studied in the literature use a phenomenon called entanglement to address the problem of distinguishing signal from noise, which is one of the most important problems faced by any radar. Until recently, entanglement-based quantum radars at radio frequencies existed only in theory; their practicality was very much in doubt. The situation has changed with a recent experimental implementation of all the necessary components of a quantum two-mode squeezing (QTMS) radar, which operates at microwave frequencies and can be described as a quantum range finder. In this article, we lay out the exact problem solved by this prototype, namely quantum noise, and explain how entanglement can overcome the existence of this noise. By analyzing the QTMS radar prototype, we point out a technological route to an entanglement-based quantum radar that can, in principle, perform all tasks that radars can and must do, such as array processing, clutter suppression, and image processing (including synthetic aperture radar and inverse synthetic aperture radar).

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基于纠缠的量子雷达：从神话到现实

目前文献中研究的许多量子雷达都使用一种称为纠缠的现象来解决区分信号和噪声的问题，这是任何雷达面临的最重要的问题之一。直到最近，基于纠缠的无线电频率量子雷达还只存在于理论上。他们的实用性非常值得怀疑。随着最近量子双模挤压 (QTMS) 雷达的所有必要组件的实验性实施，情况发生了变化，该雷达在微波频率下运行，可被描述为量子测距仪。在本文中，我们列出了该原型解决的确切问题，即量子噪声，并解释了纠缠如何克服这种噪声的存在。通过分析 QTMS 雷达原型，