Angle-robust Two-Qubit Gates in a Linear Ion Crystal

• URL: http://arxiv.org/abs/2210.04814v1
• Date: Mon, 10 Oct 2022 16:24:18 GMT
• Title: Angle-robust Two-Qubit Gates in a Linear Ion Crystal
• Authors: Zhubing Jia, Shilin Huang, Mingyu Kang, Ke Sun, Robert F. Spivey, Jungsang Kim and Kenneth R. Brown
• Abstract summary: Two-qubit entangling gates are generated by applying spin-dependent force which uses phonons to mediate interaction between the internal states of the ions. To maintain high-fidelity two-qubit gates under fluctuating experimental parameters, robust pulse-design methods are applied. We experimentally measure the performance of the designed gates and see an improvement on both gate fidelity and gate performance under uniform mode frequency offsets.
• Score: 2.1368199320952286
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In trapped-ion quantum computers, two-qubit entangling gates are generated by applying spin-dependent force which uses phonons to mediate interaction between the internal states of the ions. To maintain high-fidelity two-qubit gates under fluctuating experimental parameters, robust pulse-design methods are applied to remove the residual spin-motion entanglement in the presence of motional mode frequency drifts. Here we propose an improved pulse-design method that also guarantees the robustness of the two-qubit rotation angle against uniform mode frequency drifts by combining pulses with opposite sensitivity of the angle to mode frequency drifts. We experimentally measure the performance of the designed gates and see an improvement on both gate fidelity and gate performance under uniform mode frequency offsets.

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