I'm currently reading this paper https://arxiv.org/abs/quant-ph/0403062 but I fail to understand how the input of the control qubit affects the output of the target qubit. I do understand that when the logical value of the control qubit channel is $\vert 0\rangle$ the qubit in the channel of the target qubit is not affected. But I don't see how does the gate work when the control and target qubit have a logical value of $\vert 1\rangle$.

  • 4
    $\begingroup$ quoting or including in the post the relevant parts of the paper would make the question easier to answer without people having to go read the paper itself $\endgroup$
    – glS
    May 27 at 19:16
  • $\begingroup$ Looks like they cited this paper regarding the CNOT they implement: arxiv.org/pdf/quant-ph/0112088.pdf $\endgroup$
    – chrysaor4
    May 28 at 9:57

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