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Detecting entanglement of quantum channels
Chaojian Li,Bang-Hai Wang,Bujiao Wu,Xiao Yuan
Figure 1. The CNOT or SWAP gate with local depolarizing noise. Given maximally entangled input states ΦAA=|ΦΦ|AA and ΦBB=|ΦΦ|BB, the output state corresponds to the Choi state of the noise channel. The task is to detect the entanglement of the output state between the bipartition between AA and BB.