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We investigate the ground state of a (1+1)-dimensional conformal field theorybuilt with $M$ species of massless free Dirac fermions coupled at one boundarypoint via a conformal junction/interface. Each CFT represents a wire of finitelength $L$. We develop a systematic strategy to compute the R\'enyi entropiesfor a generic bipartition between the wires and the entanglement negativitybetween two non-complementary sets of wires. Both these entanglement measuresturn out to grow logarithmically with $L$ with an exactly calculated universalprefactor depending on the details of the junction and of the bipartition.These analytic predictions are tested numerically for junctions of free Fermigases, finding perfect agreement.

R\'enyi entropy and negativity for massless Dirac fermions at conformal interfaces and junctions