Quantum illumination is a protocol and concept in quantum information science and quantum optics, which is primarily used for the detection of weak signals in the presence of noise. It is based on the principles of quantum mechanics and leverages entanglement and quantum correlations to improve detection performance. In classical sensing scenarios, detecting a faint signal (like a weak reflection from an object) can be challenging because of environmental noise that obscures the signal. Quantum illumination utilizes pairs of entangled photons.
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