Capacity of optical communication in loss and noise with general quantum Gaussian receivers
Capacity of optical communication in loss and noise with general quantum Gaussian receivers
Laser-light (coherent-state) modulation is sufficient to achieve the ultimate (Holevo) capacity of classical communication over a lossy and noisy optical channel, but requires a receiver that jointly detects long modulated code words with highly nonlinear quantum operations, which are near-impossible to realize using current technology. We analyze the capacity of …