Phys. Rev. Lett. 97, 023602 (2006) [4 pages]Realization of Four-Level Qudits Using BiphotonsReceived 13 January 2006; published 13 July 2006 The novel experimental realization of four-level optical quantum systems (ququarts) is presented. We exploit the polarization properties of the frequency nondegenerate biphoton field to obtain such systems. A simple method that does not rely on am interferometer is used to generate and measure the sequence of states that can be used in quantum key distribution protocol. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.023602
DOI:
10.1103/PhysRevLett.97.023602
PACS:
42.50.Dv, 03.67.Mn
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