Recent experiments have demonstrated two-qubit fidelities above 99%, however, theoretically, the fidelity of CNOT operations is limited by off-resonant driving described by off-diagonal terms in the system Hamiltonian. Here we investigate these off-diagonal contributions and we propose a fidelity improvement of several orders of magnitude by using asymmetric driving. Therefore, we provide a description of an ac virtual gate based on a simple capacitance model which not only enables a high fidelity CNOT but also crosstalk reduction when scaling up spin qubit devices to larger arrays.
@article{arxiv.2112.11304,
title = {High-fidelity CNOT gate for spin qubits with asymmetric driving using virtual gates},
author = {Irina Heinz and Guido Burkard},
journal= {arXiv preprint arXiv:2112.11304},
year = {2022}
}