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I don't have a copy of LaTeX with Qcircuit handy right now, but the following should do it: \Qcircuit @C=0.25cm @R=.25cm { & \qw & \ctrl{2} & \qw & \qw\\ \lstick{\psi_1} & \qw \link{1}{1} & & \link{1}{-1} & \rstick{\psi_2} \qw \\ & & \\ \lstick{\psi_2} & \qw \link{-1}{1} & & \link{-1}{-1} & \rstick{\...


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