Quantum Cryptography Using Entangled Photons in Energy-Time Bell States

W. Tittel, J. Brendel, H. Zbinden, and N. Gisin
Phys. Rev. Lett. 84, 4737 – Published 15 May 2000
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We present a setup for quantum cryptography based on photon pairs in energy-time Bell states and show its feasibility in a laboratory experiment. Our scheme combines the advantages of using photon pairs instead of faint laser pulses and the possibility to preserve energy-time entanglement over long distances. Moreover, using four-dimensional energy-time states, no fast random change of bases is required in our setup: Nature itself decides whether to measure in the energy or in the time base, thus rendering eavesdropper attacks based on “photon number splitting” less efficient.

  • Received 29 November 1999


©2000 American Physical Society

Authors & Affiliations

W. Tittel, J. Brendel, H. Zbinden, and N. Gisin

  • Group of Applied Physics, University of Geneva, CH-1211, Geneva 4, Switzerland

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Vol. 84, Iss. 20 — 15 May 2000

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