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A TaggedOperation tag indicating that the operation is virtual.
Virtual operations are one that do not correspond to some physical signal sent
to the quantum computer. An example of such an operation is a Z rotation gates
where the gate is not enacted in the circuit, but instead is tracked in software.
Another example is noise that has been added to a gate to make it appear as
a noisy gate in a
Operations marked with this tag are presumed to have zero duration of their own, although they may have a non-zero duration if run in the same Moment as a non-virtual operation.
__eq__( other )