The O(1) contribution to entanglement entropy in 2D interface CFT is given by the BOPE coefficients of the Rényi twist operator via a boundary twist operator anchored on the interface.
Lashkari,Modular hamiltonian for excited states in conformal field theory,Physical Review Letters117(2016)
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Twist Operator BOPE and Entanglement Entropy in 2D Interface CFT
The O(1) contribution to entanglement entropy in 2D interface CFT is given by the BOPE coefficients of the Rényi twist operator via a boundary twist operator anchored on the interface.