Revisiting the Dolinar Receiver through Multiple-Copy State Discrimination Theory

TL;DR

This paper reinterprets the Dolinar receiver using multiple-copy state discrimination theory, providing new insights and proposing a suboptimal scheme that slightly outperforms existing near-optimal methods.

Contribution

It offers a novel reinterpretation of the Dolinar receiver through multiple-copy discrimination and introduces a new suboptimal detection scheme with improved performance.

Findings

Reinterpretation of Dolinar receiver via multiple-copy discrimination

Proposed a suboptimal detection scheme outperforming some existing methods

Analysis of the behavior of the Dolinar receiver using new theoretical insights

Abstract

We consider the problem of discriminating between two quantum coherent states by interpreting a single state like being a collection of several successive copies of weaker coherent states. By means of recent results on multiple-copy state discrimination, it is possible to give a reinterpretation of the Dolinar receiver, and carry out a quite straightforward analysis of its behavior. We also propose and investigate a suboptimal detection scheme derived from the Dolinar's architecture, which is shown to slightly outperform some other near-optimal schemes available in literature.