Security improvement of using modified coherent state for quantum cryptography

Abstract

Weak coherent states as a photon source for quantum cryptography have limit in secure data rate and transmission distance because of the presence of multi-photon events and loss in transmission line. Two-photon events in a coherent state can be taken out by a two-photon interference scheme. We investigate the security issue of utilizing this modified coherent state in quantum cryptography. A 4 dB improvement in secure data rate or a nearly two-fold increase in transmission distance over the coherent state are found. With a recently proposed and improved encoding strategy, further improvement is possible.

5 pages, 2 figures, to appear in Physical Review A

References in corpus (5)

• Security Aspects of Practical Quantum Cryptography
• Triggered single photons from a quantum dot
• Quantum cryptography protocols robust against photon number splitting attacks for weak laser pulses implementations
• Security against individual attacks for realistic quantum key distribution
• Photon antibunching in the fluorescence of individual color centers in diamond

Cited by in corpus (7)

• Time-Domain Multiplexed 2-Dimensional Cluster State: Universal Quantum Computing Platform
• Decoy State Quantum Key Distribution With Modified Coherent State
• Pulse-regulated single-photon generation via quantum interference in a ${\chi }^{(2)}$ nonlinear nanocavity
• Investigation of a single-photon source based on quantum interference
• Gaussian private quantum channel with squeezed coherent states
• Correlated Multiphoton Holes
• Phase Dependent Hanbury-Brown and Twiss effect