High-tolerance antiblockade SWAP gates using optimal pulse drivings

Position error is treated as the leading obstacle that prevents Rydberg antiblockade gates from being experimentally realizable, because of the inevitable fluctuations in the relative motion between two atoms, invalidating the antiblockade condition. In this work we report progress towards a high-tolerance antiblockade-based Rydberg SWAP gate enabled by the use of a modified antiblockade condition combined with carefully optimized laser pulses. Depending on the optimization of diverse pulse shapes, our protocol shows that the amount of time spent in the double Rydberg state can be shortened by more than 70% with respect to the case using the perfect antiblockade condition, which significantly reduces this position error. Moreover, we benchmark the robustness of the gate by taking into account the technical noises, such as the Doppler dephasing due to atomic thermal motion, the fluctuations in laser intensity and laser phase, and the intensity inhomogeneity. Compared to other existing antiblockade-gate schemes, we are able to maintain a predicted gate fidelity above 0.91 after a very conservative estimation of various experimental imperfections, especially considered for a realistic interaction deviation of 8V/V approximate to 5.92% at T similar to 20 mu K. Our work creates an opportunity for the experimental demonstration of Rydberg antiblockade gates in the near future.