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29 March 2013 High numerical aperture diffractive optical elements for neutral atom quantum computing
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The viability of neutral atom based quantum computers is dependent upon scalability to large numbers of qubits. Diffractive optical elements (DOEs) offer the possibility to scale up to many qubit systems by enabling the manipulation of light to collect signal or deliver a tailored spatial trapping pattern. DOEs have an advantage over refractive microoptics since they do not have measurable surface sag, making significantly larger numerical apertures (NA) accessible with a smaller optical component. The smaller physical size of a DOE allows the micro-lenses to be placed in vacuum with the atoms, reducing aberration effects that would otherwise be introduced by the cell walls of the vacuum chamber. The larger collection angle accessible with DOEs enable faster quantum computation speeds. We have designed a set of DOEs for collecting the 852 nm fluorescence from the D2 transition in trapped cesium atoms, and compare these DOEs to several commercially available refractive micro-lenses. The largest DOE is able to collect over 20% of the atom’s radiating sphere whereas the refractive micro-optic is able to collect just 8% of the atom’s radiating sphere.
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A. L. Young, S. A. Kemme, J. R. Wendt, T. R. Carter, and S. Samora "High numerical aperture diffractive optical elements for neutral atom quantum computing", Proc. SPIE 8635, Advances in Photonics of Quantum Computing, Memory, and Communication VI, 86350L (29 March 2013);

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