(Received 21 June 2002; published 20 November 2002)
Orbital angular momentum entangled photons emitted by a down-conversion
source are in higher dimensional entangled states. Here we report the
experimental confirmation by demonstrating a violation of a generalized
Clauser-Horne-Shimony-Holt–type Bell inequality in three dimensions by more
than 18 standard deviations. Higher dimensional entangled states allow the
realization of new types of quantum communication protocols. They also
provide a more secure quantum cryptography scheme. Therefore our
experimental results are likely to have applications in future quantum
communication technology. ©2002 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v89/e240401
doi:10.1103/PhysRevLett.89.240401
PACS: 03.65.Ud, 03.67.Hk, 42.50.Gy Additional Information
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