Experimental device-independent quantum key distribution between distant users

• URL: http://arxiv.org/abs/2110.00575v1
• Date: Fri, 1 Oct 2021 17:59:02 GMT
• Title: Experimental device-independent quantum key distribution between distant users
• Authors: Wei Zhang, Tim van Leent, Kai Redeker, Robert Garthoff, Rene Schwonnek, Florian Fertig, Sebastian Eppelt, Valerio Scarani, Charles C.-W. Lim, and Harald Weinfurter
• Abstract summary: Device-independent quantum key distribution (DIQKD) is the art of using untrusted devices to establish secret keys over an untrusted channel. Here, we demonstrate for the first time the distribution of a secure key in a fully device-independent way between two users separated by 400 metres.
• Score: 2.673057393751639
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Device-independent quantum key distribution (DIQKD) is the art of using untrusted devices to establish secret keys over an untrusted channel. So far, the real-world implementation of DIQKD remains a major challenge, as it requires the demonstration of a loophole-free Bell test across two remote locations with very high quality entanglement to ensure secure key exchange. Here, we demonstrate for the first time the distribution of a secure key -- based on asymptotic security estimates -- in a fully device-independent way between two users separated by 400 metres. The experiment is based on heralded entanglement between two independently trapped single Rubidium 87 atoms. The implementation of a robust DIQKD protocol indicates an expected secret key rate of r=0.07 per entanglement generation event and r>0 with a probability error of 3%. Furthermore, we analyse the experiment's capability to distribute a secret key with finite-size security against collective attacks.

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