Implementing optimal control pulse shaping for improved single-qubit gates

TL;DR

This paper demonstrates how pulse shaping can significantly reduce single-qubit gate errors in transmon qubits by correcting phase errors caused by weak anharmonicity, leading to improved quantum gate fidelity.

Contribution

The study introduces a pulse shaping technique that corrects anharmonicity-induced phase errors in transmon qubits, enhancing gate performance across multiple qubits.

Findings

Achieved a minimum average error per gate of 0.007 with 4 ns pulses.

Successfully corrected phase errors caused by higher energy levels.

Demonstrated improved gate fidelity using shaped pulses and derivative control.

Abstract

We employ pulse shaping to abate single-qubit gate errors arising from the weak anharmonicity of transmon superconducting qubits. By applying shaped pulses to both quadratures of rotation, a phase error induced by the presence of higher levels is corrected. Using a derivative of the control on the quadrature channel, we are able to remove the effect of the anharmonic levels for multiple qubits coupled to a microwave resonator. Randomized benchmarking is used to quantify the average error per gate, achieving a minimum of 0.007+/-0.005 using 4 ns-wide pulse.