Quantum radar operates by generating pairs of entangled photons. One photon from each pair, called the signal photon, is transmitted towards the target, while the other, known as the idler photon, is kept in a secure location. When the signal photon interacts with the target and returns, it remains entangled with the idler photon. By comparing the properties of the returning signal photon with the idler photon, precise information about the target can be extracted.
