The unintentional interactions between neighboring qubits in quantum processors, known as crosstalk, pose a significant obstacle to achieving accurate large-scale quantum computations. These so-called coherent errors happen when a control pulse for one qubit influences nearby qubits and are difficult to detect and correct.

Now, a multi-disciplinary team led by Berkeley Lab has demonstrated a practical, scalable, and experimentally validated method for modeling crosstalk in a multi-qubit superconducting quantum processor. The method enables researchers to investigate the dynamics of multi-qubit circuits without the need for new experiments, providing a diagnostic tool for characterizing whole-chip crosstalk.

The team included researchers from Berkeley Lab’s ATAP and Applied Mathematics & Computational Research Divisions, and the National Energy Research Scientific Computing Center (NERSC), as well as the Institute for Quantum Computing in Canada, Keysight Technologies, and the University of California, Berkeley.

Learn more:
First-principle crosstalk dynamics and Hamiltonian learning via Rabi experiments
September 25, 2025 / MobiSys ’25: Proceedings of the 23rd Annual International Conference on Mobile Systems, Applications and Services
Authors: Jan Balewski, Adam Winick, Yilun Xu, Neel Vora, Gang Huang, David Santiago, Joseph Emerson, Irfan Siddiqi