Photon engineering for quantum information processing
- 1 October 2003
- journal article
- Published by Rinton Press in Quantum Information and Computation
- Vol. 3 (special) , 480-502
- https://doi.org/10.26421/qic3.s-3
Abstract
We study distinguishing information in the context of quantum interference involving more than one parametric downconversion (PDC) source and in the context of generating 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.Keywords
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