Quantum radar
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Quantum radar is a speculative remote-sensing technology based on quantum-mechanical effects, such as the uncertainty principle or quantum entanglement. Broadly speaking, a quantum radar can be seen as a device working in the microwave range, which exploits quantum features, from the point of view of the radiation source and/or the output detection, and is able to outperform a classical counterpart. One approach is based on the use of input quantum correlations (in particular, quantum entanglement) combined with a suitable interferometric quantum detection at the receiver (strongly related to the protocol of quantum illumination).
Paving the way for a technologically viable prototype of a quantum radar involves the resolution of a number of experimental challenges as discussed in some review articles,[1][2][3] the latter of which pointed out "inaccurate reporting" in the media. Current experimental designs seem to be limited to very short ranges, of the order of one meter,[4][5][6] suggesting that potential applications might instead be for near-distance surveillance or biomedical scanning.