Bob t2

2nd qubit CNOT gate on 3rd qubit selectively modifies state vectors in each circuit.

CNOT or Conditional NOT is a two qubit operation with the 2nd qubit 'control' on 3rd qubit 'target' so that the target's state is negated if the control has state |1>.

Here, state vectors |010> and |110> are transformed to state vectors |011> and |111> and vice-versa, since the 2nd qubit is 1 i.e. |x1x>.

This appears as an swap of color between orange |010> and sand |011>, and also between red |110> and pink |111>, relative to the previous tab 'S-Gate' state