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High Energy Physics - Theory, hep-th,Mathematical Physics, math-ph,Mathematics, Mathematical Physics, math.MP,Quantum Physics, quant-ph
Abstract:
We derive the entanglement entropy of chiral fermions on the circle at
arbitrary temperature. The spin-sector contribution depends only on the total
length of the entangling region, regardless of the configuration of the
intervals. Thus mutual information is independent of the spin boundary
conditions, a property that does not hold for higher R\'enyi mutual
information. Together with the modular Hamiltonian, this provides a systematic
way of obtaining relative entropy on the torus.