Physics – Quantum Physics
Scientific paper
2003-05-30
Quantum Information and Computation 3, 480 (2003)
Physics
Quantum Physics
23 pages, 13 figures. submitted to Quantum Information & Computation
Scientific paper
We study distinguishing information in the context of quantum interference involving more than one parametric downconversion (PDC) source and in the context of polarization-entangled photon pairs based on PDC. We arrive at specific design criteria for two-photon sources so that when used as part of complex optical systems, such as photon-based quantum information processing schemes, distinguishing information between the photons is eliminated guaranteeing high visibility interference. We propose practical techniques which lead to suitably engineered two-photon states that can be realistically implemented with available technology. Finally, we study an implementation of the nonlinear-sign shift (NS) logic gate with PDC sources and show the effect of distinguishing information on the performance of the gate.
Banaszek Konrad
U'Ren Alfred B.
Walmsley Ian A.
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