High-fidelity molecular quantum logic gates resilient to interaction fluctuation

• URL: http://arxiv.org/abs/2605.19741v1
• Date: Tue, 19 May 2026 12:11:47 GMT
• Title: High-fidelity molecular quantum logic gates resilient to interaction fluctuation
• Abstract summary: We show that two $$ pulses of global microwave excitation can yield a high-fidelity controlled-phase gate.<n>The gate is resilient to the uncertainty of DDI because it does not rely on populating DDI-coupled states.
• Score: 18.425228375218236
• License: http://creativecommons.org/licenses/by/4.0/
• 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 high-fidelity controlled-phase gate when assisted by two single-qubit gates. The gate is resilient to the uncertainty of DDI because it does not rely on populating DDI-coupled states. Further, the controlled phase is fully tunable by varying the relative phase of the two global microwave pulses, and, hence, the gate can find applications in a wide range of quantum algorithms involving quantum Fourier transform. Moreover, we introduce a motional-mode separation technique to quantum mechanically study the influence of the molecular motion, which shows that the gate fidelity can be over 0.9999 with typical experimental conditions.

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