Scalable protocol to mitigate ZZ crosstalk in universal quantum gates

Abstract

High-fidelity universal quantum gates are widely acknowledged as essential for scalable quantum computation. However, in solid-state quantum systems, which hold promise as physical implementation platforms for quantum computation, the inevitable ZZ crosstalk resulting from interqubit interactions significantly impairs quantum operation performance. Here we propose a scalable protocol to achieve ZZ-crosstalk mitigation in universal quantum gates. This method converts the noisy Hamiltonian with ZZ crosstalk into a framework that efficiently suppresses all ZZ-crosstalk effects, leading to ideal target quantum operations. Specifically, we first analytically derive the ZZ-crosstalk mitigation conditions and then apply them to enhance the performance of target universal quantum gates. Moreover, numerical simulations validate the effectiveness of ZZ-crosstalk mitigation when multiple qubit gates operate concurrently. As a result, our protocol presents a promising approach for implementing practical parallel quantum gates in large-scale quantum computation scenarios.