Experimental quantum key distribution with active phase randomization

Details Experimental quantum key distribution with active phase randomization Experimental quantum key distribution with active phase randomization

2006-11-06

arxiv.org/abs/quant-ph/0611059v1

Appl. Phys. Lett., 90 (4), 044106 (2007)

Physics

Quantum Physics

3 pages, 3 figures, RevTEX

Scientific paper

10.1063/1.2432296

Phase randomization is an important assumption made in many security proofs of practical quantum key distribution (QKD) systems. Here, we present the first experimental demonstration of QKD with reliable active phase randomization. One key contribution is a polarization-insensitive phase modulator, which we added to a commercial phase-coding QKD system to randomize the global phase of each bit. We also proposed a simple but useful method to verify experimentally that the phase is indeed randomized. Our result shows very low QBER (<1%). We expect this active phase randomization process to be a standard part in future QKD set-ups due to its significance and feasibility.

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