Spin Shuttling Through Quantum-Dot Based Chiral Molecular Bridges: Gauge Constraints, Holonomy, and Quantum Gates

Chiral molecular bridges between silicon quantum dots can provide novel two-qubit entangling resources via the chirality-induced spin-selectivity (CISS) effect. We evaluate this using Makhlin invariants. Modeling a phase-coherent bridge as an SU(2)-valued hopping between two spins, a Schrieffer-Wolff reduction yields a twisted exchange interaction J S₁ · R S₂, whose Dzyaloshinskii-Moriya and symmetric anisotropic parts are fixed by a single bridge angle $α$. Using the Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) gauge argument, we prove this interaction is locally equivalent to isotropic exchange; thus, a single chiral bond does not constitute a new entangling class. Breaking this gauge symmetry reveals genuine chiral utility: chiral exchange converts a uniform transverse field into a synthetic gradient, bringing the two-qubit propagator within 7×10⁻⁴ of the CNOT class in invariant space 4.7 times faster than an equivalent orthogonal gradient. Shuttling a spin through bridges with non-collinear axes implements a non-Abelian SU(2) holonomy, yielding rotationally non-reciprocal transport and closed-loop geometric gates that suppress dynamical-phase noise to second order. To address the unsettled microscopic origin of CISS, we introduce a unified transport channel combining coherent rotation, a direction-reversing spin filter, and pointer-basis dephasing. This model obeys an exact composition law for pumped polarization and a closed-form transverse decay law, yielding four observables that experimentally over-determine the bridge's coherent fraction Fc. Finally, we quantify silicon-specific hardware constraints, establishing the Landau-Zener valley-adiabaticity window (Eᵥ ≥ 2.1√ v) and charge-noise limit (σJ/J ≤ 3%) required for $99%$ gate fidelity.