[bogomipz]

Is there a working and practical implementation somewhere? I was under the impression it wasn't practical yet.

[hannob]

You can buy it: http://www.idquantique.com/

It's probably insecure (these things get broken regularly), not practical for any real use case and total obvious nonsense to buy it, but I think there are some banks who thought they have some money leftover that they'd sink in such devices.