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2014

Relative Entropies in Conformal Field Theory

Lashkari, Nima

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Relative entropy is a measure of distinguishability for quantum states, and plays a central role in quantum information theory.

The family of Renyi entropies generalizes to Renyi relative entropies that include as special cases most entropy measures used in quantum information theory.
We construct a Euclidean path-integral approach to Renyi relative entropies in conformal field theory, then compute the fidelity and the relative entropy of states in one spatial dimension at zero and finite temperature using a replica trick.
In contrast to the entanglement entropy, the relative entropy is free of ultraviolet divergences, and is obtained as a limit of certain correlation functions.

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