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Neutral atom array serves as an ideal platform to study the quantum logicgates, where intense efforts have been devoted to improve the two-qubit gatefidelity. We report our recent findings in constructing a different type oftwo-qubit controlled-PHASE quantum gate protocol with neutral atoms enabled byRydberg blockade, which aims at both robustness and high-fidelity. It reliesupon modulated driving pulse with specially tailored smooth waveform to gainappropriate phase accumulations for quantum gates. The major features includefinishing gate operation within a single pulse, not necessarily requiringindividual site addressing, not sensitive to the exact value of blockade shiftwhile suppressing population leakage error and rotation error. We anticipateits fidelity to be reasonably high under realistic considerations for errorssuch as atomic motion, laser power fluctuation, power imbalance, spontaneousemission and so on. Moreover, we hope that such type of protocol may inspirefuture improvements in quantum gate designs for other categories of qubitplatforms and new applications in other areas of quantum optimal control.

Two-qubit controlled-PHASE Rydberg blockade gate protocol for neutral atoms via off-resonant modulated driving within a single pulse