2012/08/31 by Charles Ci Wen Lim, Christopher Portmann, Marco Tomamichel +2
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevx.3.031006
published as Phys. Rev. X 3, 031006 (2013) · 11 pages, 2 figures
arxiv created 2013/12/27 · arxiv updated 2013/12/30
Device-independent quantum key distribution (DIQKD) in its current design requires a violation of Bell's inequality between two honest parties, Alice and Bob, who are connected by a quantum channel. However, in reality, quantum channels are lossy, and this can be exploited for attacks based on the detection loophole. Here, we propose a novel approach to DIQKD that overcomes this limitation. In particular, based on a combination between an entropic uncertainty relation and the Clauser-Horne-Shimony-Holt (CHSH) test, we design a DIQKD protocol where the CHSH test is carried out entirely in Alice's laboratory. Thus the loophole caused by channel losses is avoided.