Phys. Rev. Lett. 84, 4737–4740 (2000)Quantum Cryptography Using Entangled Photons in Energy-Time Bell StatesReceived 29 November 1999; published in the issue dated 15 May 2000 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. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.4737
DOI:
10.1103/PhysRevLett.84.4737
PACS:
03.67.Dd, 03.67.Hk
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