  We propose a measure for the "size" of a Schroedinger cat state, i.e. a
quantum superposition of two many-body states with (supposedly) macroscopically
distinct properties, by counting how many single-particle operations are needed
to map one state onto the other. This definition gives sensible results for
simple, analytically tractable cases and is consistent with a previous
definition restricted to Greenberger-Horne-Zeilinger-like states. We apply our
measure to the experimentally relevant, nontrivial example of a superconducting
three-junction flux qubit put into a superposition of left- and
right-circulating supercurrent states and find this Schroedinger cat to be
surprisingly small.
