Quantum Cryptography as a Retrodiction Problem
Albert H. Werner, Titus Franz, Reinhard F. Werner · Physical Review Letters · 2009
We propose a quantum key distribution protocol based on a quantum retrodiction protocol, known as the Mean King problem. The protocol uses a two way quantum channel. We show security against coherent attacks in a transmission-error free scenario, even if Eve is allowed to attack both transmissions. This establishes a connection between retrodiction and key distribution.