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  • Laser 2001 - World of Photonics 15th International Conference on Lasers and Electrooptics in Europe
  • Technical Digest Series (Optica Publishing Group, 2001),
  • paper SPS277

Quantum communication with single-photon two-qubit states

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Abstract

Cryptographic schemes based on the exchange of single photons, each carrying one bit of information, have been widely discussed in the literature. In some of the schemes, Alice and Bob share entangled photon pairs [1]. In others, Bob performs measurements on photons that Alice sends him [2,3]. They always need to communicate via a classical channel as well. In the standard procedures, Bob obtains, depending on the outcome of each measurement, a new bit of the secure key for about 50% of the transmitted photons [4].

© 2001 EPS

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