NOT gate
The NOT gate is probably the most familiar to those used to dealing with classical circuit diagrams. It simply inverts the values of the qubit. In addition to its classical meaning (changing 1 to 0 and 0 to 1). It also has the effect of exchanging a and b in superpositioned states, exchanging the probability that the qubit will collapse to |0> with the probability of collapse to |1> and vice versa (that is a|0> + b|1> becomes b|0> + a|1>). Although useful, it is not as often used at the two qubit, conditional NOT.
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Created by Brian Patterson
Last Modified 11/22/00