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2015 ; 5
(ä): 15610
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Heralded high-efficiency quantum repeater with atomic ensembles assisted by
faithful single-photon transmission
#MMPMID26502993
Li T
; Deng FG
Sci Rep
2015[Oct]; 5
(ä): 15610
PMID26502993
show ga
Quantum repeater is one of the important building blocks for long distance
quantum communication network. The previous quantum repeaters based on atomic
ensembles and linear optical elements can only be performed with a maximal
success probability of 1/2 during the entanglement creation and entanglement
swapping procedures. Meanwhile, the polarization noise during the entanglement
distribution process is harmful to the entangled channel created. Here we
introduce a general interface between a polarized photon and an atomic ensemble
trapped in a single-sided optical cavity, and with which we propose a
high-efficiency quantum repeater protocol in which the robust entanglement
distribution is accomplished by the stable spatial-temporal entanglement and it
can in principle create the deterministic entanglement between neighboring atomic
ensembles in a heralded way as a result of cavity quantum electrodynamics.
Meanwhile, the simplified parity-check gate makes the entanglement swapping be
completed with unity efficiency, other than 1/2 with linear optics. We detail the
performance of our protocol with current experimental parameters and show its
robustness to the imperfections, i.e., detuning and coupling variation, involved
in the reflection process. These good features make it a useful building block in
long distance quantum communication.