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

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