Adaptive receiver for Quantum PPM signals

Chen Tian, Bing Zhu

We present a quantum receiver for weak signals of the pulse position modulation (PPM) and its modification, multi-pulse PPM, which approaches the Helstrom limit. The adaptive detection strategy is performed by Bayes criterion derived from the records of an on-off single photon detector (SPD).

Kouichi Yamazaki

Yuji Fujihara, Shigeru Tatsuta, Tsuyoshi Sasaki Usuda +2 more

Yuan Zuo, Tian Chen, Bing Zhu

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

Tom A. W. Wolterink, S.R. Huisman, T. J. Huisman +2 more

Saikat Guha, Jonathan L. Habif, Masahiro Takeoka

Optical pulse-position modulation (PPM) is one of the primary modulation formats being investigated for use in deep-space communications, as well as terrestrial fiber optical communications. We consider the problem of demodulating M-ary optical PPM waveforms, and propose a structured receiver whose mean probability of symbol error is smaller than all known receivers, and approaches the Helstrom (quantum) limit of the minimum probability of error (MPE) of discriminating between the coherent-state PPM signals. The receiver uses photodetection coupled with optimized phase-coherent optical feedback control through the PPM pulse slots and a phase-sensitive parametric amplifier. We present a general framework of optical receivers known as the ‘conditional pulse nulling receiver’, and present new results on ultimate limits and achievable regions of the trade-off space between the spectral versus photon efficiency of PPM, for the single-spatial-mode far-field pure-loss optical communication channel.