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arXiv:2601.13859

Confinement-Tunable Synthetic Gauge Fields and Floquet Topological Phenomena in a Driven Quantum Wire Qubit

Dongmo Tedo Lynsia Saychele, Feulefack Ornela Claire, Danga Jeremie Edmond, Keumo Tsiaze Roger Magloire, Fridolin Melong, Kenfack-Sadem Christian, Fotue Alain Jerve, Mahouton Norbert Hounkonnou, Lukong Cornelius Fai

cond-mat.mes-hallquant-phSubmitted Jan 20, 2026• Announced Jan 21, 2026• Revised Oct 7, 2026 (v3)
v1 · Jan 20, 2026v2 · Jan 23, 2026v3 · Oct 7, 2026
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Abstract

Theoretical analysis indicates that a spin qubit in a parabolic quantum wire, when driven by a bichromatic field, generates a confinement-tunable non-Abelian synthetic gauge field that gives rise to novel Floquet topological phenomena. In the low-confinement regime, the system exhibits topological Landau-Zener (LZ) transitions, chiral Landau-Zener-St$\ddot{u}$ckelberg-Majorana (LZSM) interference, and non-Abelian geometric phases around diabolical points. These features enable holonomic quantum computation, as well as unconventional Floquet Bloch oscillations and fractal spectra. In contrast, in the strong confinement regime, narrow avoided crossings significantly suppress cross-coupling, thereby insulating the qubit from multi-photon LZSM interference. Quantitative Floquet-Lindblad analysis shows that the optimized gate times, determined by the biharmonic driving period and non-Abelian parameter-space loops, are sufficiently short to surpass primary environmental decoherence channels. When applied to high-mobility $\text{GaAs/AlGaAs}$ core-shell nanowires, this approach converts spatial drives into robust non-Abelian gauge fields, positioning quantum wire systems as a versatile and scalable platform for fault-tolerant quantum information processing.

Comments
31 pages, 15 figures

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