Abstract

We have demonstrated the exchange of sifted quantum cryptographic key over a 730 meter free-space link at rates of up to 1.0 Mbps, two orders of magnitude faster than previously reported results. A classical channel at 1550 nm operates in parallel with a quantum channel at 845 nm. Clock recovery techniques on the classical channel at 1.25 Gbps enable quantum transmission at up to the clock rate. System performance is currently limited by the timing resolution of our silicon avalanche photodiode detectors. With improved detector resolution, our technique will yield another order of magnitude increase in performance, with existing technology.

© 2004 Optical Society of America

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References

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  1. N. Gisin, G. Ribordy, W. Tittel, and H. Zbinden, �??Quantum cryptography,�?? Rev. Mod. Phys. 4, 41.1-41.8 (2002).
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    [CrossRef]
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]

IBM J. Res. Develop. (1)

A. X. Widmer and P. A. Franaszek, �??A DC-balanced, partitioned-block, 8B/10B transmission code,�?? IBM J. Res. Develop. 27, 440-451 (1983).
[CrossRef]

IEEE J. Quantum Electron. (1)

A. Spinelli, M. A. Ghioni, S. D. Cova, and L. M. Davis, �??Avalanche detector with ultraclean response for time-resolved photon counting,�?? IEEE J. Quantum Electron. 34, 817-821 (1998).
[CrossRef]

Nature (1)

C. Kurtsiefer, P. Zarda, M. Halder, H. Weinfurter, P. M. Gorman, P. R. Tapster , J. G. Rarity, �??A step towards global key distribution,�?? Nature 419, 450-450 3 (2002).
[CrossRef] [PubMed]

New J. Phys. (2)

D. Stucki, N. Gisin, O. Guinnard, G. Ribordy, and H. Zbinden, �??Quantum key distribution over 67 km with a plug&play system,�?? New J. Phys. 4, 41.1-41.8 (2002).
[CrossRef]

R. J. Hughes, J. E. Nordholt, D. Derkacs, and C. G. Peterson, �??Practical free-space quantum key distribution over 10 km in daylight and at night,�?? New J. Phys. 4, 43.1-43.14 (2002).
[CrossRef]

Phys. Rev. A (1)

B. Huttner, A. Muller, J. D. Gauthier, H. Zbinden, and N. Gisin, �??Unambiguous quantum measurement of nonorthogonal states,�?? Phys. Rev. A 54, 3783-3789 (1996).
[CrossRef] [PubMed]

Phys. Rev. Lett. (2)

V. Scarani, A. Acin, G. Ribordy, and N. Gisin, �??Quantum cryptography protocols robust against number splitting attacks for weak laser pulse implementations,�?? Phys. Rev. Lett. 92, 057901 (2004).
[CrossRef] [PubMed]

C. H. Bennett, �??Quantum cryptography using any two nonorthogonal states,�?? Phys. Rev. Lett. 68, 3121-3124 (1992).
[CrossRef] [PubMed]

Proc. of the IEEE (1)

C. H. Bennet and G. Brassard, �??Quantum cryptography: Public key distribution and coin tossing,�?? in Proc. of the IEEE Int. Conf. on Computers, Systems & Signal Processing, (Bangalore, India, December 10-12, 1984), pp. 175-179.

Proc. SPIE 5436 (1)

A. Nakassis, J. Bienfang, and C. Williams, �??Expeditious reconciliation for practical quantum key distribution,�?? to appear in Quantum Information and Computation II, Proc. SPIE 5436, (2004).
[CrossRef]

Rev. Mod. Phys. (1)

N. Gisin, G. Ribordy, W. Tittel, and H. Zbinden, �??Quantum cryptography,�?? Rev. Mod. Phys. 4, 41.1-41.8 (2002).

Other (2)

T. Kimura, Y. Nambu, T. Hatanaka, A. Tomita, H. Kosaka, K. Nakamura, �??Single-photon interference over 150-km transmission using silica-based integrated-optic interferometers for quantum cryptography,�?? Eprint quant-ph/0403104 (2004), <a href="http://arxiv.org/ftp/quant-ph/papers/0403/0403104.pdf.">http://arxiv.org/ftp/quant-ph/papers/0403/0403104.pdf</a>

D. S. Pearson and C. Elliot, �??On the optimal mean photon number for quantum cryptography,�?? Eprint quant-ph/0403065 (2004), <a href="http://arxiv.org/ftp/quant-ph/papers/0403/0403065.pdf">http://arxiv.org/ftp/quant-ph/papers/0403/0403065.pdf</a>

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Figures (3)

Fig. 1.
Fig. 1.

The experimental setup. Alice and Bob are personal computers with custom data-handling PCI boards and gigabit Ethernet cards.

Fig. 2.
Fig. 2.

Jitter in the APD from 250 ps optical pulses. The arrival times of the pulses, as reported by the APD, are histogrammed in 12.2 ps time bins. The black line shows a transmission rate of 312 MHz, the gray dashed line shows a transmission rate of 78 MHz. For both distributions the APD count rate is 100 kHz.

Fig. 3.
Fig. 3.

Sifted key bit rate and quantum bit error rate vs. mean photon number.

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