Suppression of Unwanted Interactions in a Hybrid Two-Qubit System

J Ku, X Xu, M Brink, DC McKay, JB Hertzberg… - Physical review …, 2020 - APS
J Ku, X Xu, M Brink, DC McKay, JB Hertzberg, MH Ansari, BLT Plourde
Physical review letters, 2020APS
Mitigating crosstalk errors, whether classical or quantum mechanical, is critically important
for achieving high-fidelity entangling gates in multiqubit circuits. For weakly anharmonic
superconducting qubits, unwanted ZZ interactions can be suppressed by combining qubits
with opposite anharmonicity. We present experimental measurements and theoretical
modeling of two-qubit gate error for gates based on the cross resonance interaction between
a capacitively shunted flux qubit and a transmon, and demonstrate the elimination of the ZZ …
Mitigating crosstalk errors, whether classical or quantum mechanical, is critically important for achieving high-fidelity entangling gates in multiqubit circuits. For weakly anharmonic superconducting qubits, unwanted interactions can be suppressed by combining qubits with opposite anharmonicity. We present experimental measurements and theoretical modeling of two-qubit gate error for gates based on the cross resonance interaction between a capacitively shunted flux qubit and a transmon, and demonstrate the elimination of the interaction.
American Physical Society
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