Physical Review X (Jul 2013)

Device-Independent Quantum Key Distribution with Local Bell Test

  • Charles Ci Wen Lim,
  • Christopher Portmann,
  • Marco Tomamichel,
  • Renato Renner,
  • Nicolas Gisin

DOI
https://doi.org/10.1103/PhysRevX.3.031006
Journal volume & issue
Vol. 3, no. 3
p. 031006

Abstract

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Device-independent quantum key distribution (DIQKD) in its current design requires a violation of a Bell’s inequality between two parties, Alice and Bob, who are connected by a quantum channel. However, in reality, quantum channels are lossy and current DIQKD protocols are thus vulnerable to attacks exploiting the detection loophole of the Bell test. Here, we propose a novel approach to DIQKD that overcomes this limitation. In particular, we propose a protocol where the Bell test is performed entirely on two casually independent devices situated in Alice’s laboratory. As a result, the detection loophole caused by the losses in the channel is avoided.