Quantum Illumination Target Detection

Quantum illumination fires entangled signal/idler photon pairs at a region that may hold a very weak, noise-buried target, keeps the idler photon at home, and correlates it against whatever signal light returns. This simulator lets you dial the target's reflectivity, the thermal background level, and the source brightness, then compares a classical photon-counting receiver against the quantum joint receiver using the real Chernoff-bound error-exponent scaling from the quantum-illumination literature — including the famous factor-of-4 (6 dB) advantage that survives even though the entanglement itself does not.