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Memory assisted entanglement distribution in optical fibers

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Abstract

Successful implementation of several quantum information and communication protocols require distributing entangled pairs of quantum bits in reliable manner [1, 2]. While there exists a substantial amount of recent theoretical and experimental activities dealing with non-Markovian quantum dynamics, experimental application and verification of the usefulness of memory-effects for quantum information tasks is still missing. Here we combine these two aspects and show experimentally that a recently introduced concept of nonlocal memory effects [3] allows to protect and distribute polarization entangled pairs of photons in efficient manner within optical fibers. The introduced scheme is based on correlating the environments, i.e. frequencies of the polarization entangled photons, before their physical distribution. When comparing to the case without nonlocal memory effects, we demonstrate a 12-fold improvement in the channel, or fiber length, for preserving the highly-entangled initial polarization states of photons against dephasing.

© 2014 Optical Society of America

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