Suppression of Unwanted $ZZ$ Interactions in a Hybrid Two-Qubit System

Abstract

Mitigating crosstalk errors, whether classical or quantum mechanical, is critically important for achieving high-fidelity entangling gates in multi-qubit 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 $ZZ$ interaction.

5+16 pages, 5+13 figures, corrected typos, hyperlinking fixed, modified sections in supplement

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Cited by in corpus (71)

• Circuit Quantum Electrodynamics
• Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
• Demonstration of a High-Fidelity CNOT for Fixed-Frequency Transmons with Engineered ZZ Suppression
• Suppression of crosstalk in superconducting qubits using dynamical decoupling
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