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Open Quantum Systems Decoherence Superconducting Qubits

Rotational Quantum Tunneling of a Magnetic Dipole in a Superconducting Trap

arXiv
Authors: Francis J. Headley, Fabian Müller, Emre Köse, Tim Fuchs, Hendrik Ulbricht, Daniel Braun

Year

2026

Paper ID

63758

Status

Preprint

Abstract Read

~2 min

Abstract Words

109

Citations

0

Abstract

We study the quantum dynamics of the rotational degree of freedom of a nano-magnet trapped in a superconducting trap. The nano-magnet is modeled as a magnetic dipole with magnetization pinned to the easy axis of the particle. The magnetic trap then leads to a potential barrier that hinders free rotation of the particle, but through which it can tunnel. We identified rest-gas scattering as the most important decoherence mechanism at low temperatures. A shape of the particle sufficiently close to perfect rotational symmetry about the rotational axis can protect the rotational tunneling against this decoherence mechanism, and we identify experimentally feasible parameter regimes where rotational tunneling should be observable.

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  • This paper contributes to the Superconducting Qubits research area in the Quantum Articles archive.
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  • We study the quantum dynamics of the rotational degree of freedom of a nano-magnet trapped in a superconducting trap.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2605.19125 [2] arXiv https://arxiv.org/abs/2605.19125 [3] Publisher https://arxiv.org/abs/2605.19125

Local Citation Graph (Related-Paper Links)

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External citation index: OpenAlex citation signal • updated 2026-06-15 00:27:19

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