Berry phase and entanglement of 3 qubits in a new Yang-Baxter system

Abstract

In this paper we construct a new $8\times 8$ $\mathbb{M}$ matrix from the $4\times 4$ $M$ matrix, where $\mathbb{M}$ / $M$ is the image of the braid group representation. The $8\times 8$ $\mathbb{M}$ matrix and the $4\times 4$ $M$ matrix both satisfy extraspecial 2-groups algebra relations. By Yang-Baxteration approach, we derive a unitary $\breve{R}(\theta ,\varphi )$ matrix from the $\mathbb{M}$ matrix with parameters $\varphi$ and $\theta$. Three-qubit entangled states can be generated by using the $\breve{R}(\theta ,\varphi )$ matrix. A Hamiltonian for 3 qubits is constructed from the unitary $\breve{R}(\theta ,\varphi )$ matrix. We then study the entanglement and Berry phase of the Yang-Baxter system.