Security of quantum key distribution with detectionefficiency mismatch in the multiphoton case
Abstract
Detectionefficiency mismatch is a common problem in practical quantum key distribution (QKD) systems. Current security proofs of QKD with detectionefficiency mismatch rely either on the assumption of the singlephoton light source on the sender side or on the assumption of the singlephoton input of the receiver side. These assumptions impose restrictions on the class of possible eavesdropping strategies. Here we present a rigorous security proof without these assumptions and, thus, solve this important problem and prove the security of QKD with detectionefficiency mismatch against general attacks (in the asymptotic regime). In particular, we adapt the decoy state method to the case of detectionefficiency mismatch.
 Publication:

arXiv eprints
 Pub Date:
 April 2020
 arXiv:
 arXiv:2004.07809
 Bibcode:
 2020arXiv200407809T
 Keywords:

 Quantum Physics
 EPrint:
 29 pages, 4 figures