Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Quantum Information (Quantum Communication) I
Q 28.6: Talk
Wednesday, March 16, 2022, 11:45–12:00, Q-H12
Device-Independent Quantum Key Distribution between Distant Users — •Tim van Leent1,2, Wei Zhang1,2, Kai Redeker1,2, Robert Garthoff1,2, Florian Fertig1,2, Sebastian Eppelt1,2, Rene Schwonnek3,4, Wenjamin Rosenfeld1,2,7, Valerio Scarani5,6, Charles Lim3,5, and Harald Weinfurter1,2,7 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, Munich, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Munich, Germany — 3Department of Electrical & Computer Engineering, National University of Singapore, Singapore — 4Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Germany — 5Centre for Quantum Technologies, National University of Singapore, Singapore — 6Department of Physics, National University of Singapore, Singapore — 7Max-Planck-Institut für Quantenoptik, Garching, Germany
Device-independent quantum key distribution (DIQKD) is the art of establishing secure keys over untrusted channels using untrusted devices, thereby harnessing the ultimate quantum advantage for secure communications. Here we present a proof-of-concept DIQKD experiment between two users at locations 400 meters apart [1]. For this, we employ heralded entanglement between two remote single-atom quantum memories to verify the security of the generated key with a Bell-test [2]. We show that—based on asymptotic security estimates—our apparatus establishes secure keys in a fully device-independent way.
[1] W. Zhang et al., arXiv:2110.00575 (2021)
[2] W. Rosenfeld et al., Phys. Rev. Lett. 119, 010402 (2017)