Ising Anyon Braiding Generates the Full Two-Qubit Clifford Group — E8 Intelligence Research
- 1Independent Researcher, United Kingdom
Abstract
FINDING: Ising anyon braiding gates are exactly the Clifford group; two-qubit braiding exhausts all two-qubit Clifford gates, providing a finite, topologically protected gate set. | MATH: Ising anyon fusion rules: σ×σ = 1+ψ, σ×ψ = σ, ψ×ψ = 1 (Fibonacci-like but with Majorana fermion ψ). Braid matrices: R-matrix for σ exchange acts as phase e^{±iπ/8} on the σ×σ→ψ channel and e^{±iπ/8} on the σ×σ→1 channel (relative phase e^{iπ/4}). Single-qubit braid generators: σ₁ = e^{iπ/8}·(1+iσ_z)/√2 (Hadamard-like), σ₂ = e^{iπ/8}·(1+iσ_x)/√2. These generate the single-qubit Clifford group (order 192, including Pauli group). Two-qubit braid: CNOT = e^{iπ/4}·(1+σ_z⊗σ_x+σ_x⊗σ_z−σ_z⊗σ_z)/2 — realized by a specific 4-strand braid sequence. The π/8 phase e^{iπ/8} is the key constant — it is a primitive 16th root of unity, and its square root e^{iπ/16} would be needed for non-Clifford (T-gate) but is NOT achievable by braiding alone. | CONNECTION: The phase e^{iπ/8} = (1+i)/√2 · e^{iπ/4} — geometrically,
Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com
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BibTeX
@misc{caldin2026ising,
title = {{Ising Anyon Braiding Generates the Full Two-Qubit Clifford Group — E8 Intelligence Research}},
author = {Andrew Stewart Caldin},
howpublished = {Zenodo},
year = {2026},
month = oct,
doi = {10.5281/zenodo.23464936},
url = {https://zenodo.org/records/23464936},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Ising Anyon Braiding Generates the Full Two-Qubit Clifford Group — E8 Intelligence Research
AU - Andrew Stewart Caldin
PY - 2026
DA - 2026/10/19
PB - Zenodo
DO - 10.5281/zenodo.23464936
UR - https://zenodo.org/records/23464936
AB - FINDING: Ising anyon braiding gates are exactly the Clifford group; two-qubit braiding exhausts all two-qubit Clifford gates, providing a finite, topologically protected gate set. | MATH: Ising anyon fusion rules: σ×σ = 1+ψ, σ×ψ = σ, ψ×ψ = 1 (Fibonacci-like but with Majorana fermion ψ). Braid matrices: R-matrix for σ exchange acts as phase e^{±iπ/8} on the σ×σ→ψ channel and e^{±iπ/8} on the σ×σ→1 channel (relative phase e^{iπ/4}). Single-qubit braid generators: σ₁ = e^{iπ/8}·(1+iσ_z)/√2 (Hadamard-like), σ₂ = e^{iπ/8}·(1+iσ_x)/√2. These generate the single-qubit Clifford group (order 192, including Pauli group). Two-qubit braid: CNOT = e^{iπ/4}·(1+σ_z⊗σ_x+σ_x⊗σ_z−σ_z⊗σ_z)/2 — realized by a specific 4-strand braid sequence. The π/8 phase e^{iπ/8} is the key constant — it is a primitive 16th root of unity, and its square root e^{iπ/16} would be needed for non-Clifford (T-gate) but is NOT achievable by braiding alone. | CONNECTION: The phase e^{iπ/8} = (1+i)/√2 · e^{iπ/4} — geometrically, Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com
ER -