Receiver-Device-Independent Quantum Key Distribution

Marie Ioannou1, Maria Ana Pereira1, Davide Rusca1, Fadri Grünenfelder1, Alberto Boaron1, Matthieu Perrenoud1, Alastair A. Abbott1,2, Pavel Sekatski1, Jean-Daniel Bancal1,3, Nicolas Maring1, Hugo Zbinden1, and Nicolas Brunner1

1Department of Applied Physics University of Geneva, 1211 Geneva, Switzerland
2Univ. Grenoble Alpes, Inria, 38000 Grenoble, France
3Université Paris-Saclay, CEA, CNRS, Institut de physique théorique, 91191, Gif-sur-Yvette, France

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Abstract

We present protocols for quantum key distribution in a prepare-and-measure setup with an asymmetric level of trust. While the device of the sender (Alice) is partially characterized, the receiver's (Bob's) device is treated as a black-box. The security of the protocols is based on the assumption that Alice's prepared states have limited overlaps, but no explicit bound on the Hilbert space dimension is required. The protocols are immune to attacks on the receiver's device, such as blinding attacks. The users can establish a secret key while continuously monitoring the correct functioning of their devices through observed statistics. We report a proof-of-principle demonstration, involving mostly off-the-shelf equipment, as well as a high-efficiency superconducting nanowire detector. A positive key rate is demonstrated over a 4.8 km low-loss optical fiber with finite-key analysis. The prospects of implementing these protocols over longer distances is discussed.

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Cited by

[1] Marie Ioannou, Pavel Sekatski, Alastair A. Abbott, Denis Rosset, Jean-Daniel Bancal, and Nicolas Brunner, "Receiver-device-independent quantum key distribution protocols", New Journal of Physics 24 6, 063006 (2022).

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