High-fidelity molecular quantum logic gates resilient to interaction fluctuation
- 1Hainan University
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.
Versions
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BibTeX
@article{lu2026highfidelity,
title = {{High-fidelity molecular quantum logic gates resilient to interaction fluctuation}},
author = {Yan Lu and Xiao-Feng Shi},
journal = {Physical Review Research},
year = {2026},
month = oct,
doi = {10.1103/5k4z-dgn2},
url = {https://link.aps.org/doi/10.1103/5k4z-dgn2},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - High-fidelity molecular quantum logic gates resilient to interaction fluctuation
AU - Yan Lu
AU - Xiao-Feng Shi
PY - 2026
DA - 2026/10/14
JO - Physical Review Research
DO - 10.1103/5k4z-dgn2
UR - https://link.aps.org/doi/10.1103/5k4z-dgn2
AB - 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.
SN - 2643-1564
ER -