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Gauge Holonomy as an Order-Interference Observable in the Quantum Switch

Jeffrey Satinover

Published Jul 4, 2026• 0 citations
Publisher

Abstract

The quantum switch is known to probe order-sensitive operator structure, including commutators, incompatibility measures, and unitary invariants \citep{Chi13,Ore12,Pro14,Gao22,Aza25}. Related indefinite-order protocols can read out loop-like geometric phases \citep{Zha20,Yin23,Bar24}. This paper develops the gauge-holonomy case. Let $U_{\gamma_1}$ and $U_{\gamma_2}$ be path-ordered holonomies of two loops based at a common point $x_0$ and represented unitarily on a target Hilbert space. For a standard two-branch quantum switch, with one branch applying $U$ then $V$ and the other applying $V$ then $U$, the lower off-diagonal control coherence is\[\chi=\Tr\!\left(K(U,V)\rho\right),\qquadK(U,V)=U^\dagger V^\dagger U V.\]Thus the switch reads out a based holonomy group commutator. Scalar Abelian holonomies and, more generally, commuting holonomies are order-invisible in the bare switch. Abelian parameter sensitivity can occur only through relative encoding or reference structure. Non-Abelian holonomies are directly visible through control-qubit quadratures. The finite-loop statement is exact and gauge covariant: under a common base-point transformation, $K\mapsto gKg^{-1}$, while traces and covariantly prepared target expectations are gauge invariant. The local small-loop reduction is separate and perturbative. For small based loops with logarithms $X=\Log U$ and $Y=\Log V$,\[\log K(U,V)=[X,Y]-\frac12[X+Y,[X,Y]]+\text{terms of degree }\ge 4.\]For loops contained in a coordinate patch, $X$ begins with the area contraction of the curvature, followed by loop-shape-dependent covariant-derivative and path-ordering corrections. The leading local contribution to $\log K$ is therefore a curvature-commutator term, but only in this controlled small-loop regime. A constructive gauge-loop realization, an $SU(2)$ signal model, a lattice-gauge analogue, and an experimental readout model are given. The result is an operator-level and gauge-theoretic proposal for using switch interferometry to read out non-Abelian holonomy order interference.

DOI
10.5281/zenodo.21194279

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Abstract Holonomy-first quantum frameworks treat closed-loop transformations—holonomies—as the primitive operations from which native gates are mined, rather than as derived quantities. We develop this viewpoint in two parts. First, we construct a gauge-invariant commutator-strength matrix $$S(\epsilon )$$ from trace data of short group-commutator words and use it to drive an explicit native-operation promotion protocol. The bracket-norm interpretation of $$S(\epsilon )$$ is asymptotic with a general $$O(\epsilon )$$ remainder; for inversion-symmetric primitive families all odd-order corrections vanish, giving $$O(\epsilon ^2)$$ accuracy, and a counterexample shows the symmetry cannot be dropped. The promotion criteria are operationalized as declared statistical tests—sampling-cost laws for interferometric and readout-floor regimes, a bias-corrected scale-equivalence rule, and multiplicity control—and a deterministic simulation campaign reports decision replication, false-promotion control, inverse-defect detection, and execution cost under finite-shot readout, calibration error, imperfect inverses, and visibility loss. Second, for two-particle preparations of Schmidt rank two, the common-basepoint return-amplitude residue factorizes exactly as $$\Delta P_\theta =C(\theta )H_E(\chi ,\gamma )$$ , with $$C(\theta )$$ the concurrence and $$H_E=\sin ^2(2\gamma )\sin ^4(\chi /2)$$ a calibrated loop factor, determining negativity, entanglement entropy, product fidelity, and geometric entanglement within the family. A two-boson construction realizes the encoded geometric gate $$-\sigma _x$$ on $${\textrm{span}}\{\left| 20\right\rangle ,\left| 02\right\rangle \}$$ ; under the same two-mode, same-dimension projected-scalar condition, no corresponding one-particle holonomic cycle exists unless the one-body Hamiltonian is scalar. The mathematical ingredients are established; the contribution is the invariant-readout protocol, its quantified cost and uncertainty analysis, and precise statements of what can and cannot be inferred without full operator reconstruction.

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Abstract: This work develops a unified and gauge-invariant framework in which quantum interference is described as a measurement of relative holonomy between two coherent evolutions in a combined configuration space X = M × Λ. Both the Aharonov–Bohm (Abelian) and Wilczek–Zee (non-Abelian) effects appear as limits of a single Wilson-loop observable. A block connection is introduced on the direct-sum bundle E = H ⊕ (T X ⊗ ℂ), with structure group U(n) × O(p,q), thereby unifying Berry parallel transport and Levi-Civita geometry within one connection. The formalism ensures gauge and diffeomorphism covariance, analytic well-posedness under back-reaction, and establishes conditions for reconstructing the spacetime metric from holonomy data. The resulting theory provides a mathematically consistent and experimentally testable synthesis of geometric phase, interference, and spacetime connection. Potential physical implementations include mesoscopic rings, cold-atom systems, and superconducting circuits. Keywords: geometric phase; holonomy; Aharonov–Bohm effect; Berry phase; Wilczek–Zee connection; differential geometry; quantum interference; gauge theory.

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•Feb 5, 2026•0 citations
The quantum switch is known to probe order-sensitive operator structure, including commutators, incompatibility measures, and unitary invariants \citep{Chi13,Ore12,Pro14,Gao22,Aza25}. Related indefinite-order protocols can read out loop-like geometric phases \citep{Zha20,Yin23,Bar24}. This paper develops the gauge-holonomy case. Let Uγ1U_{\gamma_1}Uγ1​​ and Uγ2U_{\gamma_2}Uγ2​​ be path-ordered holonomies of two loops based at a common point x0x_0x0​ and represented unitarily on a target Hilbert space. For a standard two-branch quantum switch, with one branch applying UUU then VVV and the other applying VVV then UUU, the lower off-diagonal control coherence is[\chi=\Tr!\left(K(U,V)\rho\right),\qquadK(U,V)=U^\dagger V^\dagger U V.]Thus the switch reads out a based holonomy group commutator. Scalar Abelian holonomies and, more generally, commuting holonomies are order-invisible in the bare switch. Abelian parameter sensitivity can occur only through relative encoding or reference structure. Non-Abelian holonomies are directly visible through control-qubit quadratures. The finite-loop statement is exact and gauge covariant: under a common base-point transformation, K↦gKg−1K\mapsto gKg^{-1}K↦gKg−1, while traces and covariantly prepared target expectations are gauge invariant. The local small-loop reduction is separate and perturbative. For small based loops with logarithms X=\LogUX=\Log UX=\LogU and Y=\LogVY=\Log VY=\LogV,[\log K(U,V)=[X,Y]-\frac12[X+Y,[X,Y]]+\text{terms of degree }\ge 4.]For loops contained in a coordinate patch, XXX begins with the area contraction of the curvature, followed by loop-shape-dependent covariant-derivative and path-ordering corrections. The leading local contribution to log⁡K\log KlogK is therefore a curvature-commutator term, but only in this controlled small-loop regime. A constructive gauge-loop realization, an SU(2)SU(2)SU(2) signal model, a lattice-gauge analogue, and an experimental readout model are given. The result is an operator-level and gauge-theoretic proposal for using switch interferometry to read out non-Abelian holonomy order interference.
Abstract Holonomy-first quantum frameworks treat closed-loop transformations—holonomies—as the primitive operations from which native gates are mined, rather than as derived quantities. We develop this viewpoint in two parts. First, we construct a gauge-invariant commutator-strength matrix S(ϵ)S(\epsilon )S(ϵ) from trace data of short group-commutator words and use it to drive an explicit native-operation promotion protocol. The bracket-norm interpretation of S(ϵ)S(\epsilon )S(ϵ) is asymptotic with a general O(ϵ)O(\epsilon )O(ϵ) remainder; for inversion-symmetric primitive families all odd-order corrections vanish, giving O(ϵ2)O(\epsilon ^2)O(ϵ2) accuracy, and a counterexample shows the symmetry cannot be dropped. The promotion criteria are operationalized as declared statistical tests—sampling-cost laws for interferometric and readout-floor regimes, a bias-corrected scale-equivalence rule, and multiplicity control—and a deterministic simulation campaign reports decision replication, false-promotion control, inverse-defect detection, and execution cost under finite-shot readout, calibration error, imperfect inverses, and visibility loss. Second, for two-particle preparations of Schmidt rank two, the common-basepoint return-amplitude residue factorizes exactly as ΔPθ=C(θ)HE(χ,γ)\Delta P_\theta =C(\theta )H_E(\chi ,\gamma )ΔPθ​=C(θ)HE​(χ,γ) , with C(θ)C(\theta )C(θ) the concurrence and HE=sin⁡2(2γ)sin⁡4(χ/2)H_E=\sin ^2(2\gamma )\sin ^4(\chi /2)HE​=sin2(2γ)sin4(χ/2) a calibrated loop factor, determining negativity, entanglement entropy, product fidelity, and geometric entanglement within the family. A two-boson construction realizes the encoded geometric gate −σx-\sigma _x−σx​ on span{∣20⟩,∣02⟩}{\textrm{span}}\{\left| 20\right\rangle ,\left| 02\right\rangle \}span{∣20⟩,∣02⟩} ; under the same two-mode, same-dimension projected-scalar condition, no corresponding one-particle holonomic cycle exists unless the one-body Hamiltonian is scalar. The mathematical ingredients are established; the contribution is the invariant-readout protocol, its quantified cost and uncertainty analysis, and precise statements of what can and cannot be inferred without full operator reconstruction.
Holonomy-first quantum frameworks treat closed-loop transformations — holonomies — as the primitive operations from which native gates are mined, rather than as derived quantities. We develop this viewpoint in two parts. First, we construct a gauge-invariant commutator-strength matrix S(ε) from trace data of short group-commutator words and use it to drive an explicit native-operation promotion protocol. The bracket-norm interpretation of S(ε) is asymptotic with a general O(ε) remainder; for inversion-symmetric primitive families all odd-order corrections vanish, giving O(ε2) accuracy, and a counterexample shows the symmetry cannot be dropped. The promotion criteria are operationalized as declared statistical tests — sampling-cost laws for interferometric and readout-floor regimes, a bias-corrected scale-equivalence rule, and multiplicity control — and a deterministic simulation campaign reports decision replication, false-promotion control, inverse-defect detection, and execution cost under finite-shot readout, calibration error, imperfect inverses, and visibility loss. Second, for two-particle preparations of Schmidt rank two, the common-basepoint return-amplitude residue factorizes exactly as ΔPθ = C(θ)HE(χ, γ), with C(θ) the concurrence and HE = sin2(2γ) sin4(χ/2) a calibrated loop factor, determining negativity, entanglement entropy, product fidelity, and geometric entanglement within the family. A two-boson construction realizes the encoded geometric gate −σx on span{|20⟩, |02⟩}; under the same two-mode, same-dimension projected-scalar condition, no corresponding one-particle holonomic cycle exists unless the one-body Hamiltonian is scalar. The mathematical ingredients are established; the contribution is the invariant-readout protocol, its quantified cost and uncertainty analysis, and precise statements of what can and cannot be inferred without full operator reconstruction. This record contains the abstract only. It is not the full text of the article. The complete peer-reviewed article is published open access in Discover Quantum Science and is freely available from the publisher at https://doi.org/10.1007/s44464-026-00037-5 — including all figures, tables, appendices and the supplementary code and data. Cite as: Kazadi J. Holonomy-first native operations geometric quantum framework and entanglement-sensitive multi-particle holonomic gates. Discover Quantum Science. 2026;2:35. https://doi.org/10.1007/s44464-026-00037-5
A spin-orbit Hamiltonian with an effective gauge structure carries two distinct loop objects that are routinely conflated: an energy-independent Wilson holonomy, which organizes interference and internal spin transport, and an energy-dependent monodromy, which quantizes the spectrum. We show that cleanly separating these objects supplies a precise, computable bridge between the loop/holonomy representation of gauge theories and condensed-matter spin-orbit transport. The construction maps a spin-orbit Hamiltonian to an effective U(1)U(1)U(1) plus internal non-Abelian connection, reduces it to a first-order transport problem, and reads physical predictions from holonomy, monodromy, curvature, and eigenphase data. Two rings make the separation explicit. For a Dirac (graphene) ring with Rashba coupling and Aharonov-Bohm flux, the total holonomy factorizes exactly into a commuting U(1)U(1)U(1) flux phase times an internal spin/pseudospin holonomy, and the spectrum follows from a holonomy-eigenvalue condition. For a Rashba-Dresselhaus ring, the internal SU(2)SU(2)SU(2) transport is genuinely non-Abelian away from the α=±βα=\pmβα=±β pure-gauge locus, where curvature controls path ordering; spectral quantization then requires an explicit first-order reduction obtained by phase-space doubling of the second-order Schrödinger problem. A non-Abelian Stokes formulation and Magnus expansion serve as ordering diagnostics rather than spectral tools. Spin-network ideas enter only as historical geometric motivation, not as a dynamical import into spintronics.
Quantum holonomies are investigated in different contexts. A geometric phase is proposed for decomposition dependent evolution, where each component of a given decomposition of a mixed state evolves independently. It is shown that this geometric phase only depends on the path traversed in the space of decompositions. A holonomy is associated to general paths of subspaces of a Hilbert space, both discrete and continuous. This opens up the possibility of constructing quantum holonomic gates in the open path setting. In the discrete case it is shown that it is possible to associate two distinct holonomies to a given path. Interferometric setups for measuring both holonomies are provided. It is further shown that there are cases when the holonomy is only partially defined. This has no counterpart in the Abelian setting. An operational interpretation of amplitudes of density operators is provided. This allows for a direct interferometric realization of Uhlmann's parallelity condition, and the possibility of measuring the Uhlmann holonomy for sequences of density operators. Off-diagonal geometric phases are generalized to the non-Abelian case. These off-diagonal holonomies are undefined for cyclic evolution, but must contain members of non-zero rank if all standard holonomies are undefined. Experimental setups for measuring the off-diagonal holonomies are proposed. The concept of nodal free geometric phases is introduced. These are constructed from gauge invariant quantities, but do not share the nodal point structure of geometric phases and off-diagonal geometric phases. An interferometric setup for measuring nodal free geometric phases is provided, and it is shown that these phases could be useful in geometric quantum computation. A holonomy associated to a sequence of quantum maps is introduced. It is shown that this holonomy is related to the Uhlmann holonomy. Explicit examples are provided to illustrate the general idea.
Abstract: This work develops a unified and gauge-invariant framework in which quantum interference is described as a measurement of relative holonomy between two coherent evolutions in a combined configuration space X = M × Λ. Both the Aharonov–Bohm (Abelian) and Wilczek–Zee (non-Abelian) effects appear as limits of a single Wilson-loop observable. A block connection is introduced on the direct-sum bundle E = H ⊕ (T X ⊗ ℂ), with structure group U(n) × O(p,q), thereby unifying Berry parallel transport and Levi-Civita geometry within one connection. The formalism ensures gauge and diffeomorphism covariance, analytic well-posedness under back-reaction, and establishes conditions for reconstructing the spacetime metric from holonomy data. The resulting theory provides a mathematically consistent and experimentally testable synthesis of geometric phase, interference, and spacetime connection. Potential physical implementations include mesoscopic rings, cold-atom systems, and superconducting circuits. Keywords: geometric phase; holonomy; Aharonov–Bohm effect; Berry phase; Wilczek–Zee connection; differential geometry; quantum interference; gauge theory.
This preprint presents a unified holonomy-first, invariant-only simulator architecture for loop-based quantum operations, integrating two complementary components:(i) an operational framework for discovering, diagnosing, and compiling native holonomic operations from closed-loop executions, and(ii) a minimal semantic language that characterizes what such loop-based operations mean when only conjugacy-invariant data are accessible. The simulator treats holonomy words—compositions of calibrated loop primitives—as the fundamental operational objects, rather than Hamiltonians, generators, or gauge-fixed operators. All semantics are defined at the level of conjugacy classes, represented operationally by invariant fingerprints such as trace moments or overlap-derived scalars. This invariant-first stance enables robust workflows that avoid full operator reconstruction, tomography, or fixed-basis assumptions. On this substrate, the simulator introduces a geometric compilation pipeline that: Extracts interaction structure from short loop compositions using commutator and nested-commutator diagnostics; Organizes noncommutativity and curvature information into a gauge-invariant interaction spectrum; Promotes reproducible, scale-consistent loop words into reusable native operations. A central contribution of the unified framework is a theorem-level semantic obstruction: the default single-system semantic tier is generically incomplete in the presence of entanglement-sensitive loop effects. This is demonstrated by introducing entanglement holonomy, a word-level invariant accessible via joint return amplitudes of entangled probes yet invisible to any reconstruction based solely on single-system class functions or mode-preserving data. As a consequence, the simulator treats the effective representation on which holonomies act as provisional rather than fixed. When invariant closure and scaling tests fail at a given tier, the simulator is forced to lift representation (e.g., from single-particle to multi-particle or encoded subspaces) as an operational necessity rather than a modeling choice. An explicit minimal example of an irreducible two-particle holonomic gate is provided within a quadratic-mode backend. The simulator does not attempt to unify classical and quantum dynamics or to provide a theory of quantum gravity. Instead, it supplies a shared holonomy-based semantic layer in which classical geometric transport and genuinely quantum effects (including entanglement) can be jointly represented and operationally distinguished using the same invariant diagnostics. This unified manuscript synthesizes and extends two previously developed components—an operational framework (GQF, DOI: 10.5281/zenodo.18303288) and a semantic foundation with an obstruction result (MHQL, DOI: 10.5281/zenodo.18332083)—to expose a structural point not apparent when they are treated separately: invariant-first compilation and representation lifting are linked by a principled semantic incompleteness theorem. The result is a rare simulator architecture that is holonomy-driven, gauge-invariant by construction, and representation-adaptive when compelled by invariant evidence.