On Faithful Matrix Representations of q-Deformed Models in Quantum Optics

Consider the q-deformed Lie algebra, tq:K^1,K^2q=1−qK^1K^2,K^3,K^1q=sK^3, K^1,K^4q=sK^4,K^3,K^2q=tK^3,K^2,K^4q=tK^4, and K^4,K^3q=rK^1, where r,s,t∈℠−0, subject to the physical properties: K^1 and K^2 are real diagonal operators, and K^3=K^4†, (†is for Hermitian conjugation). The q-deformed Lie algebra, tq is introduced as a generalized model of the Tavis–Cummings model (Tavis and Cummings 1968, Bashir and Sebawe Abdalla 1995), namely, K^1,K^2=0,K^1,K^3=−2K^3,K^1,K^4=2K^4,K^2,K^3=K^3,K^2,K^4=K^4, and K^4,K^3=K^1, which is subject to the physical properties K^1 and K^2 are real diagonal operators, and K^3=K^4†. Faithful matrix representations of the least degree of tq are discussed, and conditions are given to guarantee the existence of the faithful representations.