Uniqueness of quantum Markov chains associated with an XY -model on a Cayley tree of order 2 by Accardi, Luigi, Mukhamedov, Farrukh, Saburov, Mansoor

“…A similar construction is widely used in the definition of Gibbs states in classical statistical mechanics. Using this construction, we study the quantum Markov chain associated with an XY -model on a Cayley tree. …”
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