Triple Spin Interaction and Entanglement
نویسنده
چکیده
In quantum theory Hamilton operators with spininteractions have a long history [1 – 5]. Triple spin interaction have been studied by several authors [6 – 19]. Iglói [6] investigated an Ising model with three-spin interaction by finite-size scaling and applying free boundary conditions. Vanderzande and Iglói [7] studied the critical behaviour and logarithmic corrections of a quantum model with three-spin interaction. Alcaraz and Barber [8] and Wittlich [9] studied a onedimensional Ising quantum chain with 3N sites with staggered three-spin coupling and periodic boundary conditions. Somma et al. [10] studied the unitary operator U(t) = exp(iωtσ1⊗σ3⊗σ2). Here σ1, σ2, σ3 are the Pauli spin matrices
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