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=|Φ⟩⟨Φ|AA and ΦBB=|Φ⟩⟨Φ|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 B′B. |
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