Non-Markovian Reactivation of Quantum Relays

Stefano Pirandola; Carlo Ottaviani; Christian S. Jacobsen; Gaetana Spedalieri; Samuel L. Braunstein; Tobias Gehring; Ulrik L. Andersen

Non-Markovian Reactivation of Quantum Relays

Stefano Pirandola, Carlo Ottaviani, Christian S. Jacobsen, Gaetana Spedalieri, Samuel L. Braunstein, Tobias Gehring, Ulrik L. Andersen

Computer Science

Research output: Working paper › Preprint

Abstract

We consider a quantum relay which is used by two parties to perform several continuous-variable protocols: Entanglement swapping, distillation, quantum teleportation, and quantum key distribution. The theory of these protocols is extended to a non-Markovian model of decoherence characterized by correlated Gaussian noise. Even if bipartite entanglement is completely lost at the relay, we show that the various protocols can progressively be reactivated by the separable noise-correlations of the environment. In fact, above a critical amount, these correlations are able to restore the distribution of quadripartite entanglement, which can be localized into an exploitable bipartite form by the action of the relay. Our findings are confirmed by a proof-of-principle experiment and show the potential advantages of non-Markovian effects in a quantum network architecture.

Original language	English
Pages	1-7
Number of pages	7
Publication status	Published - 27 May 2015

Keywords

quant-ph
cond-mat.other
physics.optics

Access to Document

http://arxiv.org/pdf/1505.07457v1.pdf

Cite this

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title = "Non-Markovian Reactivation of Quantum Relays",

abstract = "We consider a quantum relay which is used by two parties to perform several continuous-variable protocols: Entanglement swapping, distillation, quantum teleportation, and quantum key distribution. The theory of these protocols is extended to a non-Markovian model of decoherence characterized by correlated Gaussian noise. Even if bipartite entanglement is completely lost at the relay, we show that the various protocols can progressively be reactivated by the separable noise-correlations of the environment. In fact, above a critical amount, these correlations are able to restore the distribution of quadripartite entanglement, which can be localized into an exploitable bipartite form by the action of the relay. Our findings are confirmed by a proof-of-principle experiment and show the potential advantages of non-Markovian effects in a quantum network architecture.",

keywords = "quant-ph, cond-mat.other, physics.optics",

author = "Stefano Pirandola and Carlo Ottaviani and Jacobsen, {Christian S.} and Gaetana Spedalieri and Braunstein, {Samuel L.} and Tobias Gehring and Andersen, {Ulrik L.}",

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T1 - Non-Markovian Reactivation of Quantum Relays

AU - Pirandola, Stefano

AU - Ottaviani, Carlo

AU - Jacobsen, Christian S.

AU - Spedalieri, Gaetana

AU - Braunstein, Samuel L.

AU - Gehring, Tobias

AU - Andersen, Ulrik L.

PY - 2015/5/27

Y1 - 2015/5/27

N2 - We consider a quantum relay which is used by two parties to perform several continuous-variable protocols: Entanglement swapping, distillation, quantum teleportation, and quantum key distribution. The theory of these protocols is extended to a non-Markovian model of decoherence characterized by correlated Gaussian noise. Even if bipartite entanglement is completely lost at the relay, we show that the various protocols can progressively be reactivated by the separable noise-correlations of the environment. In fact, above a critical amount, these correlations are able to restore the distribution of quadripartite entanglement, which can be localized into an exploitable bipartite form by the action of the relay. Our findings are confirmed by a proof-of-principle experiment and show the potential advantages of non-Markovian effects in a quantum network architecture.

AB - We consider a quantum relay which is used by two parties to perform several continuous-variable protocols: Entanglement swapping, distillation, quantum teleportation, and quantum key distribution. The theory of these protocols is extended to a non-Markovian model of decoherence characterized by correlated Gaussian noise. Even if bipartite entanglement is completely lost at the relay, we show that the various protocols can progressively be reactivated by the separable noise-correlations of the environment. In fact, above a critical amount, these correlations are able to restore the distribution of quadripartite entanglement, which can be localized into an exploitable bipartite form by the action of the relay. Our findings are confirmed by a proof-of-principle experiment and show the potential advantages of non-Markovian effects in a quantum network architecture.

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KW - cond-mat.other

KW - physics.optics

M3 - Preprint

SP - 1

EP - 7

BT - Non-Markovian Reactivation of Quantum Relays

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