Decoy state method for quantum cryptography based on phase coding into faint laser pulses. (20th November 2017)

• Record Type: Journal Article
• Authors: Kulik, S P; Molotkov, S N
• Is Part Of: Laser physics letters. Volume 14:Number 12(2017:Dec.)
• Publication Date: 2017-11-20
• Subjects: quantum key distribution -- PNS measurements -- phase coding -- decoy state; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/aa8ecc
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: We discuss the photon number splitting attack (PNS) in systems of quantum cryptography with phase coding. It is shown that this attack, as well as the structural equations for the PNS attack for phase encoding, differs physically from the analogous attack applied to the polarization coding. As far as we know, in practice, in all works to date processing of experimental data has been done for phase coding, but using formulas for polarization coding. This can lead to inadequate results for the length of the secret key. These calculations are important for the correct interpretation of the results, especially if it concerns the criterion of secrecy in quantum cryptography.