Qubit-State Purity Oscillations from Anisotropic Transverse Noise
Quantum Physics
2024-09-20 v1
Abstract
We explore the dynamics of qubit-state purity in the presence of transverse noise that is anisotropically distributed in the Bloch-sphere XY plane. We perform Ramsey experiments with noise injected along a fixed laboratory-frame axis and observe oscillations in the purity at twice the qubit frequency arising from the intrinsic qubit Larmor precession. We probe the oscillation dependence on the noise anisotropy, orientation, and power spectral density, using a low-frequency fluxonium qubit. Our results elucidate the impact of transverse noise anisotropy on qubit decoherence and may be useful to disentangle charge and flux noise in superconducting quantum circuits.
Cite
@article{arxiv.2409.12303,
title = {Qubit-State Purity Oscillations from Anisotropic Transverse Noise},
author = {David A. Rower and Kotaro Hida and Lamia Ateshian and Helin Zhang and Junyoung An and Max Hays and Sarah E. Muschinske and Christopher M. McNally and Samuel C. Alipour-Fard and Réouven Assouly and Ilan T. Rosen and Bethany M. Niedzielski and Mollie E. Schwartz and Kyle Serniak and Jeffrey A. Grover and William D. Oliver},
journal= {arXiv preprint arXiv:2409.12303},
year = {2024}
}