Exploring the noise spectrum impacting a qubit and extending its coherence duration are fundamental components of quantum technologies. In this study, we introduce parametric spectroscopy, a method that merges parametric modulation of a qubit's energy gap with dynamical decoupling sequences. The parametric modulation provides high sensitivity to extensive regions of the noise spectrum, while dynamical decoupling reduces the effect of driving noise. Our theoretical study shows that parametric spectroscopy enables access to the difficult high-frequency domain of the flux spectrum in transmons.
@article{arxiv.2503.05258,
title = {Spectrum analysis with parametrically modulated transmon qubits},
author = {Nir Gavrielov and Santiago Oviedo-Casado and Alex Retzker},
journal= {arXiv preprint arXiv:2503.05258},
year = {2025}
}
Comments
18 pages and 8 figures including the appendixes. Comments welcome