The advanced notebooks, mobile phones, and Internet applications in today's world that we
use are all entrenched in classical communication bits of zeros and ones. Classical Internet …

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 …

Quantum secure direct communication is an important mode of quantum communication in
which secret messages are securely communicated directly over a quantum channel …

This introductory textbook is written primarily for undergraduate students of physics,
mathematics, computer science and other related disciplines. It is also expected to be …

We present an entanglement purification protocol and an entanglement concentration
protocol for electron-spin entangled states, resorting to quantum-dot spin and optical …

Quantum secure direct communication is the direct communication of secret messages
without need for establishing a shared secret key first. In the existing schemes, quantum …

Semi-quantum protocols that allow some of the users to remain classical are proposed for a
large class of problems associated with secure communication and secure multiparty …

This study proposes the first high-capacity quantum secure direct communication (QSDC)
with two-photon six-qubit hyper-entangled Bell states in two longitudinal momentum and …

Quantum secure direct communication enables a direct message exchange over a quantum
channel without any key generation in advance. Here we present a feasible protocol for long …

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 …