Measurement based entanglement under conditions of extreme photon loss
Abstract
Recent pioneering experiments have established that measuring optical emissions from two remote matter qubits can entangle them. Unfortunately the problem of photon loss from the apparatus may seem crippling -- in their breakthrough experiment Moehring et al. observed fewer than thirty successes per billion attempts. Here we describe a protocol for efficient measurement-based entanglement generation, even under conditions of such extreme loss. We employ a single additional qubit at each location, upon which we can execute parity projections in order to build up graph states to enable universal computation. By repeating the projections two or three times, we can utilise the highly imperfect entanglement heralded by single photon detection events. Consequently the impact of photon loss is mitigated, and we can gain orders of magnitude in performance.Keywords
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