Abstract

Optimal discrimination of coherent states is one of the long-standing fundamental problems in quantum communication theory. Although the minimum possible error rate (the Helstrom bound [1]) is known for almost five decades, there is no simple way to achieve it in practice. Theoretical models of optimal quantum receivers which can reach the Helstrom bound require sophisticated experimental resources such as instantaneous feedback control of the signal followed by high-bandwidth single-photon detection [2], or creation of “Schrödinger cat” states [3]. The inherent complexity of these models makes their practical realization elusive. In this work, we show a realistic optimal receiver for coherent states which admits a relatively simple technological implementation [4]. The schematic setup of the receiver is shown in Fig. 1.

© 2015 IEEE

PDF Article
More Like This
Optimal receiver for coherent signals

Denis Sych and Gerd Leuchs
SF1F.3 CLEO: Science and Innovations (CLEO_SI) 2016

Error Performance of SWN Quantum Receiver for QPSK Coherent-State Discrimination

Tian Chen and Bing Zhu
ASu2A.83 Asia Communications and Photonics Conference (ACPC) 2015

Practical limits of an optimized quantum receiver

Christoph Marquardt, Christian R. Müller, and Gerd Leuchs
LTu2I.2 Laser Science (LS) 2014

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription