Photon sorters and QND detectors using single photon emitters

TL;DR

This paper proposes a novel approach to quantum photodetection using single photon emitters as strong optical nonlinearities, enabling efficient, error-proof Bell state analysis surpassing linear optics capabilities.

Contribution

It introduces a new method for number-resolving and non-demolition photon detection using single photon emitters, enhancing quantum measurement accuracy.

Findings

Efficiency exceeds linear optics limits in Bell state analysis

Detection events unambiguously project photon states

Method is error-proof and scalable

Abstract

We discuss a new method for realizing number-resolving and non-demolition photo detectors by strong coupling of light to individual single photon emitters, which act as strong optical non-linearities. As a specific application we show how these elements can be integrated into an error-proof Bell state analyzer, whose efficiency exceeds the best possible performance with linear optics even for a modest atom-field coupling. The methods are error-proof in the sense that every detection event unambiguously projects the photon state onto a Fock or Bell state.