Entanglement through conformal interfaces

Understand

We consider entanglement through permeable interfaces in the c=1 (1+1)-dimensional conformal field theory.

• We compute the partition functions with the interfaces inserted.
• By the replica trick, the entanglement entropy is obtained analytically.
• The entropy scales logarithmically with respect to the size of the system, similarly to the universal scaling of the ordinary entanglement entropy in (1+1)-dimensional conformal field theory.