2009/10/06 by Xuan, Quyen Dinh, Zheshen Zhang, Zhang, Zheshen +2
Computer Science · #Quantum Information and Cryptography
paper · pdf · doi:10.48550/arxiv.0910.1042
We report a continuous variable key distribution system that achieves a final secure key rate of 3.45 kb/sec over a distance of 24.2 km of optical fiber. The protocol uses discrete signaling and post-selection to improve reconciliation speed and quantifies security by means of quantum state tomography. Polarization multiplexing and a frequency translation scheme permit transmission of a continuous wave local oscillator and suppression of noise from guided acoustic wave Brillouin scattering by more than 27 dB.