Breaking Quantum Encryption

My advisor, Todd Brun, and colleagues Jim Harrington, and Mark Wilde recently uploaded a paper on arXiv that shows how one can break quantum key-distribution using closed time-like curves.  Their method allows one to distinguish perfectly between non-orthogonal states which is the key (no pun intended) to break quantum key-distribution protocols.  An article in the recent Science News explains the result.   

The arXiv paper is here.