 This is the most convincing example in quantum chaology of behavior analogous to classical chaos. However, there are issues that raise questions about whether the behavior of the sequences of quantum state labels is enough to qualify the system as chaotic. For one thing, the quantum chaos conjecture is inapplicable to this system due to the continuous spectrum of the quasi-energy. More importantly, as pointed about above, exponential divergence is neither necessary nor sufficient to characterize a system as chaotic, and neither is algorithmic complexity. There are many examples of systems that are algorithmically complex but are not chaotic. Long randomly generated bit strings, no matter how they were obtained, are algorithmically complex but need not have any relationship to chaos. The behavior of the quantum labels for the kicked particle is irregular to be sure, but the actual temporal evolution of the state vectors is algorithmically compressible, so not irregular in any way. 