From SU(2) gauge theory to qubits on the fuzzy sphere

TL;DR

This paper links classical SU(2) gauge theory to quantum information by showing how internal gauge degrees of freedom can be represented as a qubit on the fuzzy sphere, providing a geometric and algebraic interpretation.

Contribution

It introduces a gauge-invariant ansatz that connects SU(2) gauge fields to non-commutative geometry and quantum bits, bridging gauge theory and quantum information.

Findings

Reduction of SU(2) gauge field to a qubit state on the fuzzy sphere

Geometric interpretation of the ansatz in principal fiber bundles

Identification of internal degrees of freedom with non-commutative coordinates

Abstract

We consider a classical pure SU(2) gauge theory, and make an ansatz, which separates the space-temporal degrees of freedom from the internal ones. This ansatz is gauge-invariant but not Lorentz invariant. In a limit case of the ansatz, obtained through a contraction map, and corresponding to a vacuum solution, the SU(2) gauge field reduces to an operator, which is the product of the generator of a global U(1) group times a Pauli matrix. We give a geometrical interpretation of the ansatz and of the contraction map in the framework of principal fiber bundles. Then, we identify the internal degrees of freedom of the gauge field with the non-commutative coordinates of the fuzzy sphere in the fundamental representation and obtain a one qubit state.