Pulse design of baseband flux control for adiabatic controlled-phase gates in superconducting circuits
Qi Ding, Alan V. Oppenheim, Petros T. Boufounos, Simon Gustavsson, Jeffrey A. Grover, Thomas A. Baran, William D. Oliver
DOI 10.1103/yskp-mfcr · Physical Review Applied
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Abstract
Despite progress towards achieving low error rates with superconducting qubits, error-prone two-qubit gates remain a bottleneck for realizing large-scale quantum computers. Therefore, a systematic framework to design high-fidelity gates becomes imperative. One type of two-qubit gate in superconducting qubits is the controlled-phase (cphase) gate, which utilizes a conditional interaction between higher-energy levels of the qubits controlled by a baseband flux pulse on one of the qubits or a tunable coupler. In this work, we study an adiabatic implementation of cphase gates and formulate the design of the control trajectory for the gate as a pulse-design problem. We show in simulation that the Chebyshev-based trajectory can, in certain cases, enable gates with gate infidelity lower by an average of 23.3% when compared to the widely used Slepian-based trajectory.
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