Scalable, efficient ion-photon coupling with phase fresnel lenses for large-scale quantum computing

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Title Scalable, efficient ion-photon coupling with phase fresnel lenses for large-scale quantum computing
Author Streed, Erik; Norton, Benjamin Geoffrey; Chapman, Justin; Kielpinski, David
Journal Name Quantum Information and Computation
Year Published 2009
Place of publication Princeton, NJ
Publisher Rinton Press, Inc.
Abstract Efficient ion-photon coupling is an important component for large-scale ion-trap quantum computing. We propose that arrays of phase Fresnel lenses (PFLs) are a favorable optical coupling technology to match with multi-zone ion traps. Both are scalable technologies based on conventional micro-fabrication techniques. The large numerical apertures (NAs) possible with PFLs can reduce the readout time for ion qubits. PFLs also provide good coherent ion-photon coupling by matching a large fraction of an ion's emission pattern to a single optical propagation mode (TEM00). To this end we have optically characterized a large numerical aperture phase Fresnel lens (NA=0.64) designed for use at 369.5 nm, the principal fluorescence detection transition for Yb+ ions. A diffractionlimited spot w0 = 350 ± 15 nm (1/e2 waist) with mode quality M2 = 1.08 ± 0.05 was measured with this PFL. From this we estimate the minimum expected free space coherent ion-photon coupling to be 0.64%, which is twice the best previous experimental measurement using a conventional multi-element lens. We also evaluate two techniques for improving the entanglement fidelity between the ion state and photon polarization with large numerical aperture lenses.
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Copyright Statement Copyright 2009 Rinton Press, Inc. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 9
Issue Number 3 & 4
Page from 0203
Page to 0214
ISSN 1533-7146
Date Accessioned 2009-07-29
Language en_AU
Research Centre Centre for Quantum Dynamics; Institute for Glycomics
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Atomic and Molecular Physics; Classical and Physical Optics
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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