Characterising port-based teleportation as universal simulator of qubit channels

Abstract Port-based teleportation (PBT) is a protocol that employs number of Bell pairs and joint measurement to enact an approximate input-output identity channel. Replacing the with different multi-qubit resource state changes enacted channel allows PBT simulate qubit channels beyond identity. The resulting from using general consequently interest. In this work, we fully characterise Choi matrix simulated by in terms its state. We also itself, finding description map Finally, exploit our expressions show improved simulations amplitude damping means finite ports.