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  • Letter
  • Open Access

High-fidelity molecular quantum logic gates resilient to interaction fluctuation

Yan Lu and Xiao-Feng Shi*

  • Center for Theoretical Physics and School of Physics and Optoelectronic Engineering, Hainan University, Haikou 570228, China

  • *Contact author: xshi@hainanu.edu.cn
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Phys. Rev. Research 8, L042004 – Published 14 October, 2026

DOI: https://doi.org/10.1103/5k4z-dgn2

Abstract

Optically trapped polar molecules are promising for quantum information processing, yet the accuracy of an entangling molecular gate is limited by the uncertainty of dipole-dipole interactions (DDI) from the molecular motion in traps. We show that two π pulses of global microwave excitation can yield a spin-echo controlled-phase gate when assisted by two single-qubit gates, where the gate is resilient to the uncertainty of DDI because it strongly suppresses populating DDI-coupled states. Further, the controlled phase is fully tunable by varying the relative phase of the two global microwave pulses, and, hence, is applicable in a wide range of quantum algorithms involving quantum Fourier transform. We introduce a motional-mode separation technique to quantum mechanically study the influence of the molecular motion, which shows that the motion-induced infidelity of the gate can be below 0.0001 with typical experimental conditions.

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Outline

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Phys. Rev. Research 8, L042004– Published 14 October, 2026
  • Received 13 April 2026
  • Accepted 1 October 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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