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

• URL: http://arxiv.org/abs/2003.02775v2
• Date: Thu, 9 Apr 2020 15:22:42 GMT
• Title: Suppression of Unwanted $ZZ$ Interactions in a Hybrid Two-Qubit System
• Authors: Jaseung Ku, Xuexin Xu, Markus Brink, David C. McKay, Jared B. Hertzberg, Mohammad H. Ansari, and B.L.T. Plourde
• Abstract summary: 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.
• Score: 0.6784745592354214
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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