Nonadiabatic geometric quantum computation with shortened path on superconducting circuits

TL;DR

This paper proposes a fast, high-fidelity nonadiabatic geometric quantum gate scheme on superconducting circuits, utilizing the shortest possible evolution path to enhance robustness and efficiency for scalable quantum computing.

Contribution

It introduces a method to find the shortest geometric path for quantum gates, enabling single-loop, high-fidelity, and robust operations with optimized pulse shaping on superconducting circuits.

Findings

Achieved geometric single-qubit gate fidelity >99.95%

Achieved two-qubit gate fidelity >99.80%

Demonstrated improved gate performance over dynamical methods

Abstract

Recently, nonadiabatic geometric quantum computation has been received much attention, due to its fast manipulation and intrinsic error-resilience characteristics. However, to obtain universal geometric quantum control, only limited and special evolution paths have been proposed, which usually requires longer gate-time and more operational steps, and thus leads to lower quality of the implemented quantum gates. Here, we present an effective scheme to find the shortest geometric path under the conventional conditions of geometric quantum computation, where high-fidelity and robust geometric gates can be realized by only single-loop evolution, and the gate performances are better than the corresponding dynamical ones. Furthermore, we can optimize the pulse shapes in our scheme to further shorten the gate-time, determined by how fast the path is travelled. In addition, we also present its physical implementation on superconducting circuits, consisting of capacitively coupled transmon qubits, where the fidelities of geometric single- and two-qubit gates can be higher than $99.95\%$ and $99.80\%$ within the current state-of-the-art experimental technologies, respectively. These results indicate that our scheme is promising for large-scale fault-tolerant quantum computation.