Dual detectors scheme in practical quantum key distribution systems

Author

Qi, B. ; Zhao, Y. ; Ma, X. ; Lo, H.K. ; Qian, L.

Author_Institution

Center for Quantum Inf. & Quantum Control, Toronto

fYear

2007

fDate

17-22 June 2007

Firstpage

1

Lastpage

1

Abstract

In this study, a "dual detectors" method is proposed to overcome the limitation imposed by the speed-noise trade-off and improve the performance of a practical quantum key distribution (QKD) system based on realistic detectors. The "dual detectors" scheme can be employed to improve the performance of a Gaussian-modulated coherent states (GMCS) QKD system based on realistic homodyne detectors, as in the case of BB84 protocol. With the "dual detectors" method, we see a significant improvement of the key rate (more than one order of magnitude) at a relatively short distance (up to 5 km).

Keywords

cryptographic protocols; homodyne detection; optical communication equipment; optical modulation; photodetectors; quantum cryptography; quantum optics; BB84 protocol; GMCS QKD system; Gaussian-modulated coherent states; dual detectors method; practical quantum key distribution systems; realistic homodyne detector; Bit error rate; Computer errors; Costs; Data privacy; Detectors; Entropy; Error correction; Physics; Protocols; Pulse amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics, 2007 and the International Quantum Electronics Conference. CLEOE-IQEC 2007. European Conference on

Conference_Location

Munich

Print_ISBN

978-1-4244-0931-0

Electronic_ISBN

978-1-4244-0931-0

Type

conf

DOI

10.1109/CLEOE-IQEC.2007.4387020

Filename

4387020