In the first quarter of the twentieth century, one of the most significant events in physics and
chemistry was the establishment of the quantum theories of radiation, matter, and their …

Communication security has to evolve to a higher plane in the face of the threat from the
massive computing power of the emerging quantum computers. Quantum secure direct …

With the progress of theoretical and applied technologies, the communication system based
on the classical encryption is seriously threatened by quantum computing and distributed …

In this paper, we generalize a secured direct communication process between N users with
partial and full cooperation of quantum server. So, N− 1 disjointed users u 1, u 2,…, u N− 1 …

Quantum communication provides an enormous advantage over its classical counterpart:
security of communications based on the very principles of quantum mechanics …

The distribution of deterministic keys is of significance in personal communications, but the
existing continuous variable quantum key distribution protocols can only generate random …

A continuous-variable quantum identity authentication protocol, which is based on quantum
teleportation, is presented by employing two-mode squeezed vacuum state and coherent …

We discuss the generation of a macroscopic entangled state in a single atom cavity-QED
system. The three-level atom in a cascade configuration interacts dispersively with two …

Motivated by the revealing features of the continuous-variable (CV) quantum cryptography,
we suggest an arbitrated quantum signature (AQS) protocol with CV coherent states. It …

Motivated by proxy signature and blind signature for the secure communications, the batch
signature is proposed to create a novel quantum cryptosystem. It is based on three …