Quantum decryption sounds expensive and time consuming, so they wouldn't be able to apply it to everything. As long as you have something basic going it might be enough deterrent to keep you out of the light. You just need a better bike lock than the other bikes have on the rack. I guess if you're being targeted specifically then there's not much you can do though.

Also, do you have more info about the courier/motorbike thing? It sounds interesting.