articleNatureJul 27, 2022HYBRID OA

A device-independent quantum key distribution system for distant users

WZWei ZhangTVTim van LeentKRKai RedekerRGRobert GarthoffRSRené Schwonnek

Munich Center for Quantum Science and Technology · Ludwig-Maximilians-Universität München · +6 more institutions

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Abstract

Abstract Device-independent quantum key distribution (DIQKD) enables the generation of secret keys over an untrusted channel using uncharacterized and potentially untrusted devices 1–9 . The proper and secure functioning of the devices can be certified by a statistical test using a Bell inequality 10–12 . This test originates from the foundations of quantum physics and also ensures robustness against implementation loopholes 13 , thereby leaving only the integrity of the users’ locations to be guaranteed by other means. The realization of DIQKD, however, is extremely challenging—mainly because it is difficult to establish high-quality entangled states between two remote locations with high detection…

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Topics & keywords

Topics
Keywords
  • Quantum key distribution
  • Key (lock)
  • Computer science
  • Quantum
  • Computer security
  • Physics
  • Quantum mechanics
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