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We report on the application of a fast physical random bit generator based on chaotic semiconductor lasers to generation of random pulse sequences at 1.0 Gpps (giga pulses per second) in a quantum key distribution system. We generate a random binary signal at 1.0 Gbps and use it to modulate the phase of optical pulses transmitted in the differential-phase-shift quantum-key-distribution (DPS-QKD) scheme.
3 dB of measured squeezing is reported for pulsed 1550-nm light generated by down-conversion in bulk PPLN. Using different pump focuses, single- and coincidence-counts in agreement with both thermal and Poissonian photon-pair distributions were obtained.
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