Quantum cryptography with an ideal local relay

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

doi:10.1117/12.2202662

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13 October 2015 Quantum cryptography with an ideal local relay

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

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Proceedings Volume 9648, Electro-Optical and Infrared Systems: Technology and Applications XII; and Quantum Information Science and Technology; 96480Z (2015) https://doi.org/10.1117/12.2202662
Event: SPIE Security + Defence, 2015, Toulouse, France

Abstract

We consider two remote parties connected to a relay by two quantum channels. To generate a secret key, they transmit coherent states to the relay, where the states are subject to a continuous-variable (CV) Bell detection. We study the ideal case where Alice's channel is lossless, i.e., the relay is locally in her lab and the Bell detection is perfomed with unit efficiency. This configuration allows us to explore the optimal performances achievable by CV measurement-device-independent quantum key distribution. This corresponds to the limit of a trusted local relay, where the detection loss can be re-scaled. Our theoretical analysis is confirmed by an experimental simulation where 10^-4 secret bits per use can potentially be distributed at 170km assuming ideal reconciliation.

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Gaetana Spedalieri, Carlo Ottaviani, Samuel L. Braunstein, Tobias Gehring, Christian S. Jacobsen, Ulrik L. Andersen, and Stefano Pirandola "Quantum cryptography with an ideal local relay", Proc. SPIE 9648, Electro-Optical and Infrared Systems: Technology and Applications XII; and Quantum Information Science and Technology, 96480Z (13 October 2015); https://doi.org/10.1117/12.2202662

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