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Quantum key distribution system clocked at 2 GHz

Karen J. Gordon, Veronica Fernandez, Gerald S. Buller, Ivan Rech, Sergio D. Cova, and Paul D. Townsend

Open Access Open Access

Abstract

An improved quantum key distribution test system operating at clock rates of up to 2GHz using a specially adapted commercially-available silicon single-photon counting module is presented. The use of an enhanced detector has improved the fiber-based quantum key distribution test system performance in terms of transmission distance and quantum bit error rate.

©2005 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Basic quantum key distribution system experimental arrangement. PPG: Pulse pattern generator, NRZ: Non return to zero pulse pattern, V0 & V1 are the high-speed VCSELs and driver boards, SPCM: Single-photon counting module, SMF: Single mode fiber.

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Fig. 2.
Fig. 2. Timing jitter full width at half maximum of the standard SPCM SPAD and the SPCM with modified output circuitry.

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Fig. 3.
Fig. 3. Shift of the peak position of the standard SPCM SPAD and the SPCM with modified output circuitry.

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Fig. 4.
Fig. 4. QBER versus QKD system clock frequency at fixed fiber distance of 6.55 km of standard telecommunications fiber.

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Fig. 5.
Fig. 5. QBER versus fiber distance at a clock frequency of 2GHz. The points filled in black are taken with the full fiber transmission distance. The white points were measured using optical attenuation to simulate the given distances.

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