期刊
NEW JOURNAL OF PHYSICS
卷 21, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/ab0be5
关键词
quantum physics; quantum computing; quantum logic; quantum gates; atomic physics; trapped-ions; geometric phase gates
资金
- US Department of Commerce, National Institute of Standards and Technology [70NANB18H006]
- ARO
- ONR
- NIST Quantum Information Program
- US Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344. LLNL-JRNL-759200]
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 (sigma) over cap (phi) circle times (sigma) over cap (phi) or (sigma) over cap (z) circle times (sigma) over cap (z) 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 (sigma) over cap (z) circle times (sigma) over cap (z) 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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