Calibration of a Cross-Resonance Two-Qubit Gate Between Directly Coupled Transmons
A.D. Patterson, J. Rahamim, T. Tsunoda, P.A. Spring, S. Jebari, K. Ratter, M. Mergenthaler, G. Tancredi, B. Vlastakis, M. Esposito, P.J. Leek · Physical Review Applied · 2019
Implementing high-fidelity entangling operations between qubits is a key challenge in quantum computing. Multiple sources of error and a large parameter space make optimization of control schemes for high-fidelity operations a complex technical challenge. This study presents a complete recipe for calibrating a high-fidelity cross-resonance gate implemented between two dispersively coupled transmon qubits, showing that even large amounts of crosstalk can be effectively canceled. This approach should be useful as a general tool for those working on experiments with coupled quantum systems, in particular for computing.