Phys. Rev. A 75, 034309 (2007) [4 pages]Generating entangled states of two ququarts using linear optical elementsReceived 9 August 2006; published 29 March 2007 We propose linear optical schemes for generating entangled states of two ququarts (four-dimensional quantum systems) in which the single-ququart state is constructed with frequency-nondegenerate biphoton polarization states of spontaneous parametric down-conversion. We show explicitly that it is possible to generate various two-ququart entangled states by interfering two ququarts at a linear optical beam splitter (an ordinary 50-50 beam splitter, a polarizing beam splitter, or a dichroic beam splitter). © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.75.034309
DOI:
10.1103/PhysRevA.75.034309
PACS:
03.67.Mn, 42.65.Lm, 03.67.−a, 03.67.Hk
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