We will present solutions to the constant Yang-Baxter equation, in any dimension
n. More precisely, for any
n, we will create an infinite family of
n2 by
n2 matrices which are solutions to the constant Yang-Baxter equation. The total number of non-vanishing entries of such a matrix is
4n2 for
n even, and
4(n−1)(n)+1 for
n odd. We will also present the unitary conditions for those matrices. Moreover, we discuss the entangling property of those matrices.
A detailed analysis of the constant quantum Yang–Baxter equation Rk1k2j1j2 Rl1k3k1j3Rl2l3k2k3= Rk2k3j2j3 Rk1l3j1k3Rl1l2k1k2 in two dimensions is presented, leading to an exhaustive list of its solutions. The set of 64 equations for 16 unknowns was first reduced by hand to several subcases which were then solved by computer using the Gröbner-basis methods. Each solution was then transformed into a canonical form (based on the various trace matrices of R) for final elimination of duplicates and subcases. If we use homogeneous parametrization the solutions can be combined into 23 distinct cases, modulo the well-known C, P, and T reflections, and rotations and scalings R̃=κ(Q⊗Q)R(Q⊗Q)−1.