Suppression of Unwanted <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mi>Z</mml:mi></mml:math> Interactions in a Hybrid Two-Qubit System
Jaseung Ku, Xuexin Xu, Markus Brink, David McKay, Jared Hertzberg, Mohammad H. Ansari, B. L. T. Plourde
Abstract
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 interaction.
Topics & Concepts
TransmonQubitPhysicsAnharmonicityQuantum computerQuantumQuantum mechanicsAlgorithmComputer scienceQuantum Information and CryptographyQuantum and electron transport phenomenaQuantum Computing Algorithms and Architecture