S. Rolston, J. R. Anderson, U. Chukwu, J. Grover, J. Hertzberg, J. Hoffman, P. Kordell, J. Lee, C. Lobb, L. Orozco, S. Ravets, P. Solano, K. Voigt, F. Wellstood, J. Wong-Campos, G. Beadie, F. Fatemi
Hybrid quantum systems can be formed that combine the strengths of multiple platforms while avoiding the weaknesses. Here we report on progress toward a hybrid quantum system of neutral atom spins coupled to superconducting qubits. We trap laser-cooled rubidium atoms in the evanescent field of an ultrathin optical fiber, which will be suspended a few microns above a superconducting circuit that resonates at the hyperfine frequency of the Rb atoms, allowing magnetic coupling between the atoms and superconductor. As this will be done in a dilution refrigerator environment, the technical demands on the optical fiber is severe. We have developed and optimized a tapered fiber fabrication system, achieving optical transmission in excess of 99.95% , and fibers that can sustain 400 mW of optical power in a UHV environment. We have also optimized tapered fibers that can support higher order optical modes with high transmission (> 97%), which may be useful for different optical potential geometries. We have developed an in-situ tunable high-Q superconducting microwave resonator that can be tuned to within the resonator linewidth of the 6.8 GHz frequency of the Rb hyperfine transition.
The generation of intra-cavity superpositions of Bessel-Gauss beams in an axicon resonator is studied numerically
by means of a genetic algorithm. The coherent superposition of low order modes is induced by introducing crossed
wires within the simulated cavity. Two different strategies are shown to be equivalent for the generation of the
same superposition of two Bessel-Gauss beams with opposite azimuthal orders. In the first strategy the angle
between a pair of cross-wires is varied for mode selection, the second consists on introducing a number of crosswires
at equally spaced angles in which the number of wires corresponds exactly to the order of the superposed
modes. Our results suggest a direct method for generating experimentally a coherent mode superposition of
Bessel-Gauss beams using an axicon-based Bessel-Gauss resonator. These beams are relevant in areas such as
optical trapping and micromanipulatio
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