Pulse Design of Baseband Flux Control for Adiabatic Controlled-Phase Gates in Superconducting Circuits

• URL: http://arxiv.org/abs/2407.02722v1
• Date: Wed, 3 Jul 2024 00:25:59 GMT
• Title: Pulse Design of Baseband Flux Control for Adiabatic Controlled-Phase Gates in Superconducting Circuits
• Authors: Qi Ding, Alan V. Oppenheim, Petros T. Boufounos, Simon Gustavsson, Jeffrey A. Grover, Thomas A. Baran, William D. Oliver,
• Abstract summary: Two-qubit error-prone gates remain a bottleneck for realizing large-scale quantum computers. One type of two-qubit gate in superconducting qubits is the controlled-phase (CPHASE) gate. We show in simulation that the Chebyshev-based trajectory can, in certain cases, enable gates with leakage error lower by an average of roughly 6%.
• Score: 5.292580203700652
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 leakage error lower by an average of roughly 6% when compared to the widely used Slepian-based trajectory.

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