Quantum Cryptography, one aspect of which is Quantum Key Distri- bution (QKD), provides the only physically secure and proven method for the transmission of a secret key between two distant parties, Alice and Bob. The goal of QKD is to guarantee that a possible eavesdropper (Eve), with access to the communication channel is unable to obtain useful information about the message. The Coherent-One-Way (COW) protocol is one of the most recent practical QKD protocols. However, its security proof still remains unrealized. We therefore present a necessary condition for the security of the COW protocol. In the proof, we describe bob's measurements by non-commuting POVM elements which satisfies this proof.
|Level (Hons, MSc, <br> PhD, other)?||PhD|
|Consider for a student <br> award (Yes / No)?||Yes|
|Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?||Yes|