Angle-robust two-qubit gates in a linear ion crystal

Jia, Zhubing; Huang, Shilin; Kang, Mingyu; Sun, Ke; Spivey, Robert F.; Kim, Jungsang; Brown, Kenneth R.

doi:10.1103/physreva.107.032617

Title: Angle-robust two-qubit gates in a linear ion crystal

Journal Article · 23 March 2023 · Physical Review A

DOI: https://doi.org/10.1103/physreva.107.032617 · OSTI ID:2280975

^[1];

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^[2]; Spivey, Robert F. ^[2];

^[3]; Brown, Kenneth R. ^[2]

Duke Univ., Durham, NC (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
Duke Univ., Durham, NC (United States)
Duke Univ., Durham, NC (United States); IonQ, Inc., College Park, MD (United States)

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 concatenating pulses with opposite sensitivity of the angle to mode-frequency drifts. Here we experimentally verify significantly improved robustness of the rotation angle against uniform mode-frequency drifts, as well as observe an improvement in gate fidelity from 97.84(10)% to 98.11(11)%, compared to a single frequency-modulated pulse.

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Research Organization:: Duke Univ., Durham, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Army Research Office (ARO); National Science Foundation (NSF); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: SC0019449; W911NF-16-1-0082; 1730104; SC0019294; W911NF-18-1-0218

OSTI ID:: 2280975

Journal Information:: Physical Review A, Vol. 107, Issue 3; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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