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Title:
Renyi entropy of highly entangled spin chains
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Abstract:
As a measure of quantum entanglement, Renyi entropy has further importance than the von Neumann entanglement entropy. The former is a one-parameter generalization of the latter. In particular, the whole spectrum of an entangled subsystem is obtained, once the Renyi entropy is known as a function of the parameter. We first analytically compute the Renyi entropy for highly entangled spin chains called as Motzkin model and Fredkin model. As a result, a new phase transition at the value of the parameter $\alpha=1$ is found.
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