One-step implementation of Rydberg-antiblockade SWAP and controlled-SWAP gates with modified robustness

The prevalent fashion of executing Rydberg-mediated two- and multi-qubit quantum gates in neutral atomic systems is to pump Rydberg excitations using multistep piecewise pulses in the Rydberg blockade regime. Here, we propose to synthesize a Lambda-type Rydberg antiblockade (RAB) of two neutral atoms using periodic fields, which facilitates one-step implementations of SWAP and controlled-SWAP (CSWAP) gates with the same gate time. Besides, the RAB condition is modified so as to circumvent the sensitivity of RAB-based gates to infidelity factors, including atomic decay, motional dephasing, and interatomic distance deviation. Our work makes up the absence of one-step schemes of Rydberg-mediated SWAP and CSWAP gates and may pave a way to enhance the robustness of RAB-based gates. (C) 2021 Chinese Laser Press

Automated summary

This study introduces a new method for synthesizing Lambda-type Rydberg antiblockade (RAB) which enables one-step implementations of SWAP and CSWAP gates while avoiding sensitivity to infidelity factors, filling the gap in existing one-step schemes for Rydberg-mediated gates.