Versatile laser-free trapped-ion entangling gates.

New J Phys 2019 ;21

Physics Division, Physical and Life Sciences, Lawrence Livermore National Laboratory, Livermore, CA 94550, United States of America.

We present a general theory for laser-free entangling gates with trapped-ion hyperfine qubits, using either static or oscillating magnetic-field gradients combined with a pair of uniform microwave fields symmetrically detuned about the qubit frequency. By transforming into a 'bichromatic' interaction picture, we show that either or geometric phase gates can be performed. The gate basis is determined by selecting the microwave detuning. The driving parameters can be tuned to provide intrinsic dynamical decoupling from qubit frequency fluctuations. The gates can be implemented in a novel manner which eases experimental constraints. We present numerical simulations of gate fidelities assuming realistic parameters.

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Source
http://dx.doi.org/10.1088/1367-2630/ab0be5DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6759860PMC
January 2019

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