Polarization-entangled Photons and Quantum Dense Coding

Paul G. Kwiat, Klaus Mattle, Harald Weinfurter, and Anton Zeilinger, Institute of Experimental Physics University of Innsbruck, Innsbruck, Austria. P. Kwiat is presently at Los Alamos National Laboratory, Los Alamos, N.M.

Entangled states of particles form the cornerstone of the newly emerging field of quantum information: they are central to tests of nonlocality, have been proposed for use in quantum cryptography schemes, and would arise automatically in the operation of quantum computers. Polarization-entangled photons are preferable because they are easier to handle.

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