Abstract
This work shows a proof-of-principle demonstration of the random entanglement distillation of Einstein-Podolsky-Rosen pairs from tripartite W states via weak measurements. The experimental distillation rate between two random parties appears larger than the theoretical limit of any distillation scheme between two specified parties.
Highlights
Multipartite entanglement is an essential resource in a quantum network that benefits quantum key distribution [1], quantum teleportation [2,3,4], and distributed quantum computation
As a proof-of-principle demonstration, we show that the distillation rate is enhanced from 2/3, which is the theoretical limit of any distillation scheme between two specified parties, to 0.751 ± 0.030 between two unspecified parties with only one distillation round
As a proof-of-principle demonstration of our scheme, we experimentally show that the rate of distilling EPR pair from one three-photon W state is enhanced to 0.751 ± 0.030 by only performing one round of weak measurement
Summary
Multipartite entanglement is an essential resource in a quantum network that benefits quantum key distribution [1], quantum teleportation [2,3,4], and distributed quantum computation. One can obtain 2/3 EPR pairs from a single copy of |W3 between any two specified parties such as Alice and Bob with this strategy, which is shown to be optimal via strong measurements [11]. In the seminal work by Fortescue and Lo [8], they proposed a scheme to randomly distill one EPR pair from one W state by performing an infinite round of weak measurements [14]. As a proof-of-principle demonstration of our scheme, we experimentally show that the rate of distilling EPR pair from one three-photon W state is enhanced to 0.751 ± 0.030 by only performing one round of weak measurement
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