Remote Flux Refocuses Nonadiabatic Excursions in Compact-State Quantum Transfer

Abstract:Compact states embedded in a propagating band can carry quantum information, but finite-time transfer can populate modes outside their subspace. We show that a remote flux can refocus this amplitude without changing the transfer states or the motion-induced coupling out of their subspace. In a resonator ring, this separation is exact because both endpoints of the flux-bearing bond are nodes of every compact transfer state. For the same pulse, zero and refocusing flux both produce substantial excursions, but only the latter yields near-complete logical transfer. Interference between matrix amplitudes associated with different windings suppresses the endpoint error. Under matched control bounds, numerical optimization yields higher worst-input fidelity at the refocusing flux, providing a route to accurate transfer through coherent return.

arXiv:2609.07198 [quant-ph]

(or arXiv:2609.07198v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.07198 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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