Fast nuclear-spin entangling gates compatible with large-scale atomic arrays

Abstract

Nuclear-spin entangling gates with divalent atoms can be executed by one global laser pulse when $Δ_{\text{Z}}<Ω$, where $Δ_{\text{Z}}$ is the Zeeman-splitting-dominated frequency difference for the clock-Rydberg transitions of the two nuclear-spin qubit states and $Ω$ is the maximal Rabi frequency. Concerning the sensitivity of Rydberg-state energy to magnetic fluctuation, the gate is compatible with large-scale atomic arrays for weaker magnetic field is suitable for ensuring uniform field in a large qubit array. The gate can have a high fidelity because the relaxation and dephasing of Rydberg states, which limit the fidelity and grow with $1/Ω$, can be mitigated with easily attainable large $Ω$.