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).
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|Publication status||Published - 2007 Mar 29|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics