[Kemschumam]

Have you seen this recent result http://news.mit.edu/2018/physicists-create-new-form-light-02....

Does it change your thoughts on the utility of quantum cryptography?

[OscarCunningham]

They get three photons to be entangled, but not "maximally entangled" in the (impossible) way that would be needed for someone to listen to a communication without being detected.