High-fidelity robust qubit control by phase-modulated pulses

TL;DR

This paper introduces phase-modulated pulses for transmon qubits that achieve high-fidelity, robust quantum operations resilient to amplitude and frequency deviations, enhancing quantum control reliability.

Contribution

The authors develop a simple, effective phase modulation scheme for robust quantum control, demonstrated on transmon qubits, with potential applicability across quantum platforms.

Findings

Achieved >20% robustness against drive amplitude deviations.

Demonstrated resilience to ~10 MHz detuning.

Implemented high-fidelity state transfer and rotations.

Abstract

We present a set of robust and high-fidelity pulses that realize paradigmatic operations such as the transfer of the ground state population into the excited state and arbitrary $X/Y$ rotations on the Bloch sphere. These pulses are based on the phase modulation of the control field. We implement these operations on a transmon qubit, demonstrating resilience against deviations in the drive amplitude of more than $\approx 20\%$ and/or detuning from the qubit transition frequency in the order of $10~\mathrm{MHz}$. The concept and modulation scheme is straightforward to implement and it is compatible with other quantum-technology experimental platforms.