Quantum Computation and Information Seminar 

23/03/2007, 15:00 — 16:00 — Room P4.35, Mathematics Building
Jan Bouda, U Masaryk

Private quantum channel: generality of the definition

The private quantum channel (PQC) is a framework defining general encryption scheme with quantum plaintext, quantum ciphertext and classical key. Recently Nayak et al derived the most general form of an invertible quantum operation and put it into context of encryption of quantum information using classical key suggesting that encryption with classical key can be more general than the original definition of PQC, that was given without justification of its generality. We use security requirements of encryption of quantum information with classical key and apply the results of Nayak et al to show that the original definition of PQC is the most general one.