Title: Qubit-state purity oscillations from anisotropic transverse noise

Journal Article · · Physical Review A
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We explore the dynamics of qubit-state purity in the presence of transverse noise that is anisotropically distributed in the Bloch-sphere X Y 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. Published by the American Physical Society 2025

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0012567; SC0012704
OSTI ID:
2531285
Journal Information:
Physical Review A, Journal Name: Physical Review A Journal Issue: 3 Vol. 111; ISSN PLRAAN; ISSN 2469-9926
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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