Improving noise threshold for optical quantum computing with the EPR photon source
Zhaohui Wei, Yu‐Hong Han, C. H. Oh, Luming Duan · Physical Review A · 2010
We show that the noise threshold for optical quantum computing obtained by Varnava et al. [Phys. Rev. Lett. 100, 060502 (2008)] can be significantly improved by replacing the single-photon source with the Einstein-Podolsky-Rosen (EPR) type of photon source. In this implementation, for an EPR source that emits either nothing (a vacuum state) or a perfect EPR state with probability ${\ensuremath{\eta}}_{s}$, the detector efficiency ${\ensuremath{\eta}}_{d}$ is required to be larger than $50%$ and the source efficiency ${\ensuremath{\eta}}_{s}$ can be an arbitrarily small positive number. We also present the error threshold for a more general noise model including additional photon absorption and show that the threshold still compares favorably with the previous results. We discuss several physical setups for realization of the required EPR photon source, including a photon emitter in a single-atom cavity.