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.
Mezei,Entanglement entropy across a deformed sphere,Physical Review D91(2015)
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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.