Evolution of $1/f$ Flux Noise in Superconducting Qubits with Weak Magnetic Fields Article Swipe

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David A. Rower , Lamia Ateshian , Lauren H. Li , Max Hays , Dolev Bluvstein , Leon Ding , Bharath Kannan , Aziza Almanakly , Jochen Braumüller , David Kim , Alexander Melville , Bethany M. Niedzielski , Mollie E. Schwartz , Jonilyn Yoder , Terry P. Orlando , Joel I-Jan Wang , Simon Gustavsson , Jeffrey A. Grover , Kyle Serniak , Riccardo Comin , William D. Oliver ·

YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2301.07804

The microscopic origin of $1/f$ magnetic flux noise in superconducting circuits has remained an open question for several decades despite extensive experimental and theoretical investigation. Recent progress in superconducting devices for quantum information has highlighted the need to mitigate sources of qubit decoherence, driving a renewed interest in understanding the underlying noise mechanism(s). Though a consensus has emerged attributing flux noise to surface spins, their identity and interaction mechanisms remain unclear, prompting further study. Here we apply weak in-plane magnetic fields to a capacitively-shunted flux qubit (where the Zeeman splitting of surface spins lies below the device temperature) and study the flux-noise-limited qubit dephasing, revealing previously unexplored trends that may shed light on the dynamics behind the emergent $1/f$ noise. Notably, we observe an enhancement (suppression) of the spin-echo (Ramsey) pure dephasing time in fields up to $B=100~\text{G}$. With direct noise spectroscopy, we further observe a transition from a $1/f$ to approximately Lorentzian frequency dependence below 10 Hz and a reduction of the noise above 1 MHz with increasing magnetic field. We suggest that these trends are qualitatively consistent with an increase of spin cluster sizes with magnetic field. These results should help to inform a complete microscopic theory of $1/f$ flux noise in superconducting circuits.

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Physics

Condensed Matter Physics

Artificial Intelligence

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Dephasing Flux qubit Physics Qubit Condensed matter physics Noise (video) Spins Zeeman effect Superconductivity Superconducting quantum computing Magnetic flux Magnetic field Quantum decoherence Spin (aerodynamics) Quantum mechanics Quantum Josephson effect Computer science Artificial intelligence Thermodynamics Image (mathematics)

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2301.07804
PDF: https://arxiv.org/pdf/2301.07804
OA Status: green
Cited By: 3
Related Works: 10
OpenAlex ID: https://openalex.org/W4320521597

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DOI: https://doi.org/10.48550/arxiv.2301.07804

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Title: Evolution of $1/f$ Flux Noise in Superconducting Qubits with Weak Magnetic Fields

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Type: preprint

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Language: en

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Publication year: 2023

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Publication date: 2023-01-18

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Authors: David A. Rower, Lamia Ateshian, Lauren H. Li, Max Hays, Dolev Bluvstein, Leon Ding, Bharath Kannan, Aziza Almanakly, Jochen Braumüller, David Kim, Alexander Melville, Bethany M. Niedzielski, Mollie E. Schwartz, Jonilyn Yoder, Terry P. Orlando, Joel I-Jan Wang, Simon Gustavsson, Jeffrey A. Grover, Kyle Serniak, Riccardo Comin, William D. Oliver

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Landing page: https://arxiv.org/abs/2301.07804

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PDF URL: https://arxiv.org/pdf/2301.07804

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Concepts: Dephasing, Flux qubit, Physics, Qubit, Condensed matter physics, Noise (video), Spins, Zeeman effect, Superconductivity, Superconducting quantum computing, Magnetic flux, Magnetic field, Quantum decoherence, Spin (aerodynamics), Quantum mechanics, Quantum, Josephson effect, Computer science, Artificial intelligence, Thermodynamics, Image (mathematics)

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Cited by: 3

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Citations by year (recent): 2025: 1, 2023: 2

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