Stabilization of Qubit Relaxation Rates by Frequency Modulation

TL;DR

This paper proposes a method to stabilize qubit relaxation rates by applying frequency modulation, which averages out fluctuations caused by atomic-scale defects, improving qubit coherence consistency.

Contribution

The study introduces frequency modulation as a technique to mitigate qubit relaxation fluctuations due to two-level defects, enhancing qubit stability.

Findings

Frequency modulation averages relaxation rates over a broad frequency range.

Mitigates fluctuations caused by atomic-scale defects.

Improves stability of superconducting qubits.

Abstract

Temporal, spectral, and sample-to-sample fluctuations in coherence properties of qubits form an outstanding challenge for the development of upscaled fault-tolerant quantum computers. A ubiquitous source for these fluctuations in superconducting qubits is a set of atomic-scale defects with a two-level structure. Here we propose a way to mitigate these fluctuations and stabilize the qubit performance. We show that frequency modulation of a qubit or, alternatively, of the two-level defects, leads to averaging of the qubit relaxation rate over a wide interval of frequencies.