Concept 33 of 42 · Interacting Topological Phases

Non-Abelian braiding and encoded gates

Exchanging non-Abelian anyons can rotate a protected degenerate subspace.

01 / The mathematical statement
$$U_{ij}=\exp\!\left(\frac{\pi}{4}\gamma_i\gamma_j\right)$$

What this means

Exchanging non-Abelian anyons can rotate a protected degenerate subspace.

Deep dive: mathematical and physical mechanism

For ideal Ising/Majorana anyons, exchanging adjacent Majoranas implements $U_{ij}$ up to orientation and phase convention. Gates depend on braid topology rather than fine details of paths, provided adiabaticity and separation hold.

How it appears in quantum phenomena

Topological quantum computing proposals encode information in fusion spaces.

Assumptions, caveats and limitations

Braiding Ising anyons alone is not computationally universal; additional resources are needed.

Connect the ideas

For context, see the Interacting Topological Phases topic guide and the reading references.

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