Brilliant!

Jonathan Home at the US National Institute of Standards and Technology in Boulder, Colorado, says Neeley's team needs to extend its basic system in such a way that two or more qudits can transport information between them, which would allow more complex computational operations to be undertaken.
"Designing the sort of system where two qudits interact, but still retain the interesting properties of a five-level system, will be a major challenge," Home says.

Did he say "challenge"? I bet we're going to see this working anytime soon.