Conditional Pulse Nulling Receiver for Multi-pulse PPM and Binary Quantum Coding Signals

TL;DR

This paper demonstrates that a conditional pulse nulling receiver, optimized with dynamic programming, can outperform the standard quantum limit in discriminating multi-pulse PPM and binary quantum coding signals, enhancing quantum communication efficiency.

Contribution

It extends the application of the CPN receiver to multi-pulse PPM and binary quantum coding signals with optimized control strategies, improving quantum signal discrimination.

Findings

CPN receiver outperforms SQL for MPPM signals

Optimized control strategies enhance receiver performance

Numerical simulations confirm improved discrimination accuracy

Abstract

Conditional pulse nulling (CPN) receiver is proposed by Dolinar to discriminate pulse position modulation (PPM) signals. The receiver using a beam splitter and an on-off photon detector can outperform the standard quantum limit (SQL) for PPM signals. In this paper, we apply this receiver to multi-pulse PPM (MPPM) and binary quantum coding signals, and use dynamic programming algorithm to optimize the control strategy. The MPPM signals is used to improve the band-utilization efficiency, and the binary quantum coding make the communication able to correct the error. Numerical simulation results show that the CPN receiver with optimized strategy can also outperform SQL for both MPPM and binary quantum coding signals.