Improving noise threshold for optical quantum computing with the EPR photon source

TL;DR

This paper demonstrates that using an EPR photon source can significantly improve the noise threshold in optical quantum computing, requiring less stringent detector and source efficiencies compared to single-photon sources.

Contribution

The paper introduces a method to enhance noise thresholds in optical quantum computing by employing EPR-type photon sources, relaxing efficiency requirements.

Findings

Detector efficiency $ ext{η}_d$ must be >50%

Source efficiency $ ext{η}_s$ can be arbitrarily small

Threshold compares favorably with single-photon source implementations

Abstract

We show that the noise threshold for optical quantum computing can be significantly improved by using the EPR-type of photon source. In this implementation, the detector efficiency $\eta_{d}$ is required to be larger than 50%, and the source efficiency $\eta_{s}$ can be an arbitrarily small positive number. This threshold compares favorably with the implementation using the single-photon source, where one requires the combined efficiency $\eta_{d}\eta_{s}>2/3$. We discuss several physical setups for realization of the required EPR photon source, including the photon emitter from a single-atom cavity.