Environment-assisted bosonic quantum communications
- URL: http://arxiv.org/abs/2003.09246v1
- Date: Fri, 20 Mar 2020 12:58:44 GMT
- Title: Environment-assisted bosonic quantum communications
- Authors: Stefano Pirandola, Carlo Ottaviani, Christian S. Jacobsen, Gaetana
Spedalieri, Samuel L. Braunstein, Tobias Gehring, and Ulrik L. Andersen
- Abstract summary: We consider a quantum relay which is used by two parties to perform several continuous-variable protocols of quantum communication.
In the worst case scenario where bipartite entanglement is completely lost at the relay, we show that the various protocols can be reactivated by the assistance of classical (separable) correlations in the environment.
Our findings are confirmed by a proof-of-principle experiment where we show, for the first time, that memory effects in the environment can drastically enhance the performance of a quantum relay.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We consider a quantum relay which is used by two parties to perform several
continuous-variable protocols of quantum communication, from entanglement
distribution (swapping and distillation), to quantum teleportation, and quantum
key distribution. The theory of these protocols is suitably extended to a
non-Markovian model of decoherence characterized by correlated Gaussian noise
in the bosonic environment. In the worst case scenario where bipartite
entanglement is completely lost at the relay, we show that the various
protocols can be reactivated by the assistance of classical (separable)
correlations in the environment. In fact, above a critical amount, these
correlations are able to guarantee the distribution of a weaker form of
entanglement (quadripartite), which can be localized by the relay into a
stronger form (bipartite) that is exploitable by the parties. Our findings are
confirmed by a proof-of-principle experiment where we show, for the first time,
that memory effects in the environment can drastically enhance the performance
of a quantum relay, well beyond the single-repeater bound for quantum and
private communications.
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