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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 2002),
  • paper QThD2

Quantum Cloning and Multi-photon Quantum Cryptography

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Abstract

Multi-photon states from stimulated parametric down-conversion can be entangled both in polarization and photon number. Maximally high-dimension entanglement can be concentrated from these states via photon-counting. We show experimental results for the concentration of a rotational symmetric four-photon entangled state obtained by stimulated emission of the familiar anti-symmetric two-particle Bell state.1

© 2002 Optical Society of America

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