Balanced Tripartite Entanglement, the Alternating Group A4 and the Lie Algebra $sl(3,C) \oplus u(1)$

TL;DR

This paper explores the encoding of three-qubit entangled states into quantum gates, finite groups, and Lie algebras, revealing new connections between entanglement classes, group structures, and potential applications in physics and biology.

Contribution

It introduces a novel balanced entanglement class and demonstrates how the group $A_4$ and the Lie algebra $sl(3,C) $ emerge from three-qubit states, linking quantum information with algebraic structures.

Findings

Realization of the $W(E_8)$ group with three-qubit gates

Identification of the $A_4$ group from $W(E_8)$ via subgroup chains

Connection between entanglement classes and algebraic structures

Abstract

We discuss three important classes of three-qubit entangled states and their encoding into quantum gates, finite groups and Lie algebras. States of the GHZ and W-type correspond to pure tripartite and bipartite entanglement, respectively. We introduce another generic class B of three-qubit states, that have balanced entanglement over two and three parties. We show how to realize the largest cristallographic group $W(E_8)$ in terms of three-qubit gates (with real entries) encoding states of type GHZ or W [M. Planat, {\it Clifford group dipoles and the enactment of Weyl/Coxeter group $W(E_8)$ by entangling gates}, Preprint 0904.3691 (quant-ph)]. Then, we describe a peculiar "condensation" of $W(E_8)$ into the four-letter alternating group $A_4$, obtained from a chain of maximal subgroups. Group $A_4$ is realized from two B-type generators and found to correspond to the Lie algebra $sl(3,\mathbb{C})\oplus u(1)$. Possible applications of our findings to particle physics and the structure of genetic code are also mentioned.