An Adaptive Quantum Receiver for Binary Coding Signals Outperforming the Standard Quantum Limit

We present a joint-detection quantum receiver scheme. Performance of the receiver is improved by adaptive control strategy based on Bayes criterion and optimized displacement followed by single photon detection in each temporal slot. The adaptive quantum receiver is applied to on-off keying (OOK) and binary phase shift keying (BPSK) modulated binary coding signals. Numerical simulation shows that the adaptive quantum receiver can outperform the standard quantum limit (SQL).