Phonon-induced frequency shift in semiconductor spin qubits

TL;DR

This paper investigates how phonon interactions cause temperature-dependent frequency shifts in semiconductor spin qubits, explaining experimental observations and identifying optimal temperature ranges for stable qubit operation.

Contribution

It provides a theoretical analysis of phonon-induced frequency shifts in spin qubits and estimates the temperature range for minimal sensitivity.

Findings

Phonon interactions explain non-monotonic frequency dependence on temperature.

Identification of a temperature 'sweet spot' for stable qubit frequency.

Insights into low-temperature behavior of semiconductor spin qubits.

Abstract

Spin qubits have proven to be a feasible candidate for quantum computation, and some realizations of spin qubits already benefit from advanced device manufacturing in the semiconductor industry. Compared to superconducting platforms, spin qubits can operate at higher temperatures from tens of millikelvin up to a few kelvin. However, recent experiments show a non-trivial and often non-monotonic dependence of the spin qubit frequency on the temperature, featuring a region of decreased sensitivity to temperature fluctuations. In this work, we aim to gain insight into the physics behind such temperature shifts in the low-temperature limit. Investigating the spin qubits' interaction with phonon modes of the host material, we can explain some of the key features of the observed behavior and estimate the temperature sweet spot for the qubit frequency shift.