Qubit-state purity oscillations from anisotropic transverse noise
We explore the dynamics of qubit-state purity in the presence of transverse noise that is anisotropically distributed in the Bloch-sphere <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi>X</a:mi><a:mi>Y</a:mi></a:mrow></a:math> 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 for disentangling charge and flux noise in superconducting quantum circuits.
Authors
- Max Hays (ORCID: https://orcid.org/0000-0002-6241-1628)
- Lamia Ateshian (ORCID: https://orcid.org/0000-0001-8898-6764)
- Junyoung An (ORCID: https://orcid.org/0009-0005-8294-7349)
- Sarah E. Muschinske
- Kazuyuki Hida
- David A. Rower (ORCID: https://orcid.org/0000-0003-2845-5616)
- Kyle Serniak (ORCID: https://orcid.org/0000-0003-3469-9166)
- William D. Oliver (ORCID: https://orcid.org/0000-0001-8041-0824)
- Jeffrey A. Grover (ORCID: https://orcid.org/0000-0001-6835-8517)
- Christopher M. McNally (ORCID: https://orcid.org/0000-0002-4927-0613)
- Mollie E. Schwartz (ORCID: https://orcid.org/0000-0003-4406-8974)
- Réouven Assouly (ORCID: https://orcid.org/0000-0002-9853-5972)
- Bethany M. Niedzielski (ORCID: https://orcid.org/0000-0002-8277-8064)
- Ilan T. Rosen (ORCID: https://orcid.org/0000-0001-8869-7364)
- Helin Zhang (ORCID: https://orcid.org/0000-0002-7390-9210)
- Samuel C. Alipour-Fard
Institutions
- The NSF AI Institute for Artificial Intelligence and Fundamental Interactions (US)
- Massachusetts Institute of Technology (US)
- The University of Tokyo (JP)
Publication Details
- Journal
- Physical review. A/Physical review, A
- Published
- 2025-03-18
- DOI
- https://doi.org/10.1103/physreva.111.032420
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- U.S. Department of Energy
- Office of the Director of National Intelligence
- Korea Foundation for Advanced Studies
- Office of Science
- Oak Ridge Institute for Science and Education
- Air Force Office of Scientific Research
- Army Research Office