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A minimal single-brane holographic model can be used as a dual to 2dconformal interfaces (ICFTs) to calculate the transmission coefficient$\mathcal{T}$ of energy transported across the defect as well as boundaryentropy $\log g$, the additional entanglement entropy for some sub-region thatencloses the defect. Both $\mathcal{T}$ and $\log g$ are uniquely determined bythe tension characterizing the brane. In contrast, in field theory defectstypically the transmission coefficient can be dialed from 0 to 1 independentlyfor each allowed value of $\log g$. To address this discrepancy, we look at adouble brane (3-region bulk) holographic model. Merger of two single braneinterfaces creates genuinely new interfaces which indeed allow a range ofaccessible transmission coefficients for a fixed value of $\log g$. Inparticular, the $\mathcal{T}=0$ limit of two completely decoupled BCFTs can beachieved.

Double brane holographic model dual to 2d ICFTs