High Efficiency DOEs at Large Diffraction Angles for Quantum Information and Computing Architectures

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Title High Efficiency DOEs at Large Diffraction Angles for Quantum Information and Computing Architectures
Author Cruz-Cabrera, A. A.; Kemme, S. A.; Wendt, J. R.; Kielpinski, David; Streed, Erik; Carter, T. R.; Samora, S.
Publication Title Proceedings of the International Society for Optical Engineering (SPIE)
Editor Zameer U. Hasan
Year Published 2007
Place of publication Bellingham, Washington, USA
Publisher SPIE- the International Society for Optical Engineering
Abstract We developed techniques to design higher efficiency diffractive optical elements (DOEs) with large numerical apertures (NA) for quantum computing and quantum information processing. Large NA optics encompass large solid angles and thus have high collection efficiencies. Qubits in ion trap architectures are commonly addressed and read by lasers1. Large-scale ion-trap quantum computing2 will therefore require highly parallel optical interconnects. Qubit readout in these systems requires detecting fluorescence from the nearly isotropic radiation pattern of single ions, so efficient readout requires optical interconnects with high numerical aperture. Diffractive optical element fabrication is relatively mature and utilizes lithography to produce arrays compatible with large-scale ion-trap quantum computer architectures. The primary challenge of DOEs is the loss associated with diffraction efficiency. This is due to requirements for large deflection angles, which leads to extremely small feature sizes in the outer zone of the DOE. If the period of the diffractive is between lambda (the free space wavelength) and 10lambda, the element functions in the vector regime. DOEs in this regime, particularly between 1.5lambda and 4lambda, have significant coupling to unwanted diffractive orders, reducing the performance of the lens. Furthermore, the optimal depth of the zones with periods in the vector regime differs from the overall depth of the DOE. We will present results indicating the unique behaviors around the 1.5lambda and 4lambda periods and methods to improve the DOE performance.
Peer Reviewed No
Published Yes
Alternative URI http://dx.doi.org/10.1117/12.702133
ISBN 978-0-8194-6595-5
Conference name Advanced Optical and Quantum Memories and Computing IV
Location San Jose, CA, USA
Date From 2007-01-24
Date To 2007-01-25
URI http://hdl.handle.net/10072/18111
Date Accessioned 2007-08-02
Language en_AU
Research Centre Institute for Glycomics; Centre for Quantum Dynamics
Faculty Faculty of Science, Environment, Engineering and Technology
Subject PRE2009-Optics and Opto-electronic Physics
Publication Type Conference Publications (Full Written Paper - Non-Refereed)
Publication Type Code e2

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