Linking Classical and Quantum Key Agreement: Is There a Classical Analog to Bound Entanglement?

Nicolas Gisin Renato Renner Stefan Wolf Linking Classical and Quantum Key Agreement: Is There a Classical Analog to Bound Entanglement? 389-412 2002 34 Algorithmica 4 http://link.springer.de/link/service/journals/00453/contents/02/0972/index.html db/journals/algorithmica/algorithmica34.html#GisinRW02