State-Independent Nonadiabatic Geometric Quantum Gates

Quantum computation has demonstrated advantages over classical computation for special hard problems, where a set of universal quantum gates is essential. Geometric phases, which have built-in resilience to local noise, have been used to construct quantum gates with excellent performance. However, this advantage has been smeared in previous schemes. Here, we propose a state-independent nonadiabatic geometric quantum-gate scheme that is able to realize a more fully geometric gate than previous approaches, allowing for the cancelation of dynamical phases accumulated by an arbitrary state. Numerical simulations demonstrate that our scheme has significantly stronger gate robustness than the previous geometric and dynamical ones. Meanwhile, we give a detailed physical implementation of our scheme with the Rydberg atom system based on the Rydberg blockade effect, specifically for multiqubit control-phase gates, which exceeds the fault-tolerance threshold of multiqubit quantum gates within the considered error range. Therefore, our scheme provides a promising way for fault-tolerant quantum computation in atomic systems.

Automated summary

In this study, we propose a state-independent nonadiabatic geometric quantum-gate scheme that enables the realization of a more fully geometric gate and cancels the dynamical phases accumulated by an arbitrary state. Numerical simulations demonstrate that our scheme has significantly stronger gate robustness than previous geometric and dynamical schemes. Additionally, we provide a detailed physical implementation of our scheme using the Rydberg atom system, specifically for multiqubit control-phase gates, which surpasses the fault-tolerance threshold of multiqubit gates in the considered error range. Therefore, our scheme offers a promising approach for fault-tolerant quantum computation in atomic systems.