Quantum Illumination Radar

Quantum illumination is one of the few entanglement-based protocols proven to give a real advantage even after the entanglement itself is completely wiped out by loss and thermal noise. This simulator sends entangled signal/idler photon pairs from a source at one end of the scene: the idler is routed directly to a quantum receiver while the signal crosses a noisy region toward a weakly reflective target, reflects with probability κ, and returns for a joint measurement against the retained idler. Live statistics track the empirical detection error rate of this quantum-correlated receiver against an unentangled classical radar of the same transmitted brightness, converging to the textbook result that quantum illumination can improve the error-probability exponent by up to a factor of four — a 6 dB advantage — over the best possible classical scheme, precisely in the noisy, low-photon regime real radar and LIDAR jamming scenarios occupy.