Noncyclic nonadiabatic geometric quantum gates in a superconducting circuit

Quantum gates based on geometric phases possess intrinsic noise-resilience features and attract much attention. However, the implementations of previous geometric quantum computation typically require a long pulse time of gates. As a result, their experimental control inevitably suffers from the cumulative disturbances of systematic errors due to excessive time consumption. Here, we experimentally implement noncyclic and nonadiabatic geometric quantum gates in a superconducting circuit, significantly shortening the gate time. Moreover, we experimentally verify that our universal single-qubit geometric gates are more robust to both the Rabi frequency and the qubit frequency shift-induced error, compared with the conventional dynamical gates, using the randomized benchmarking method. This scheme can also be utilized to construct two-qubit geometric operations while the generation of maximally entangled Bell states is demonstrated. Therefore, our results provide a promising routine to achieve fast, high-fidelity, and error-resilient quantum gates in superconducting quantum circuits.

Automated summary

In this study, we successfully implemented noncyclic and nonadiabatic geometric quantum gates in a superconducting circuit, greatly reducing the gate time. Using the randomized benchmarking method, we experimentally demonstrated the robustness of these gates to systematic errors and also showed their potential for two-qubit geometric operations and the generation of maximally entangled Bell states.