High-fidelity and robust single-qubit gate on a neutral atom using transitionless quantum driving

Abstract

Efficient adiabatic control of quantum states is critical for implementing Rydberg-atom-based quantum computing. While adiabatic techniques offer robustness to experimental fluctuations, their quantum state transfer efficiency is constrained by long evolution times. To address this limitation, we implement transitionless quantum driving (TQD) to accelerate the adiabatic evolution in a ladder-type three-level cesium atom. We demonstrate that TQD achieves high-fidelity single-qubit quantum gate operations while maintaining robustness against decoherence and environmental noises. Numerical simulations reveal that TQD provides a trade-off between fast speed, robustness and high fidelity, surpassing the normal adiabatic method. TQD achieves a quantum state transfer efficiency of over 99.9 %, twice the adiabatic performance metrics, four times faster evolution rates, and 23 % enhanced fidelity in preparing the Rydberg state (F = 0.9993) and coherent superposition states (F = 0.9997), respectively. This work demonstrates TQD on a Rydberg atom, with potential applications in quantum computing system deployment.