Multiplexed entanglement swapping with atomic-ensemble-based quantum memories in the single excitation regime
arxiv(2023)
Abstract
Entanglement swapping (ES) between memory repeater links is critical for
establishing quantum networks via quantum repeaters. So far, ES with
atomic-ensemble-based memories has not been achieved. Here, we experimentally
demonstrated ES between two entangled pairs of spin-wave memories via
Duan-Lukin-Cirac-Zoller scheme. With a cloud of cold atoms inserted in a
cavity, we produce non-classically-correlated spin-wave-photon pairs in 12
spatial modes and then prepare two entangled pairs of spin-wave memories via a
multiplexed scheme. Via single-photon Bell measurement on retrieved fields from
two memories, we project the two remaining memories never entangled previously
into an entangled state with the measured concurrence of C = 0.0124(0.003). The
successful probability of ES in our scheme is increased by three times,
compared with that in non-multiplexed scheme. Our presented work shows that the
generation of entanglement (C>0) between the remaining memory ensembles
requires the average cross-correlation function of the spin-wave-photon pairs
to be >30 .
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