Experimental study on discretely modulated continuous-variable quantum key distribution

Journal Article · Sun Aug 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.022317· OSTI ID:21448464

Yong, Shen; Hongxin, Zou; Pingxing, Chen; Jianmin, Yuan ^[1]; Liang, Tian ^[1]

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1. Department of Physics, National University of Defense Technology, Changsha 410073 (China)

We present a discretely modulated continuous-variable quantum key distribution system in free space by using strong coherent states. The amplitude noise in the laser source is suppressed to the shot-noise limit by using a mode cleaner combined with a frequency shift technique. Also, it is proven that the phase noise in the source has no impact on the final secret key rate. In order to increase the encoding rate, we use broadband homodyne detectors and the no-switching protocol. In a realistic model, we establish a secret key rate of 46.8 kbits/s against collective attacks at an encoding rate of 10 MHz for a 90% channel loss when the modulation variance is optimal.

• OSTI ID: 21448464
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
ANNIHILATION OPERATORS
CRYPTOGRAPHY
DISTRIBUTION
EIGENSTATES
FREQUENCY RANGE
MATHEMATICAL OPERATORS
MECHANICS
MHZ RANGE
MODULATION
NOISE
QUANTUM CRYPTOGRAPHY
QUANTUM MECHANICS
QUANTUM OPERATORS
QUANTUM STATES
SPACE