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International Conference on Quantum Information

Engineering Multiparameter Entangled State With Adaptive Optics

Alexander V. Sergienko, Cristian Bonato, Stefano Bonora, Paolo Villoresi

Published Jan 1, 2008• 0 citations
Publisher

Abstract

We discuss the possibility of actively manipulating parameters of entangled states generated by type-II parametric down conversion. We study the effect our active manipulation of wavevector distribution using adaptive mirror will have on the behavior of polarization-temporal interference. The use of an actively engineered spatial entanglement allows us to maintain a high-visibility interference despite the negative effect of spatial walk off.

DOI
10.1364/icqi.2008.qmb1

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We discuss the possibility of actively manipulating parameters of entangled states generated by type-II parametric down conversion. We study the effect our active manipulation of wavevector distribution using adaptive mirror will have on the behavior of polarization-temporal interference. The use of an actively engineered spatial entanglement allows us to maintain a high-visibility interference despite the negative effect of spatial walk off.
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The role of multiparameter entanglement in quantum interference from collinear Type-II spontaneous parametric down-conversion is explored using a variety of aperture shapes and sizes, in regimes of both ultrafast and continuous-wave pumping. We have developed and experimentally verified a theory of down-conversion which considers a quantum state that can be concurrently entangled in frequency, wavevector, and polarization. In particular, we demonstrate deviations from the familiar triangular interference dip, such as asymmetry and peaking. These findings improve our capacity to control the quantum state produced by spontaneous parametric down-conversion, and should prove useful to those pursuing the many proposed applications of down-converted light.
A theory of spontaneous parametric down-conversion, which gives rise to a quantum state that is entangled in multiple parameters, such as three-dimensional wave vector and polarization, allows us to understand the unusual characteristics of fourth-order quantum interference in many experiments, including ultrafast type-II parametric down-conversion, the specific example illustrated in this paper. The comprehensive approach provided here permits the engineering of quantum states suitable for quantum-information schemes and quantum technologies.