Title :
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
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;
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
DOI :
10.1109/CLEOE-IQEC.2007.4387020
