We analyzed the security of the secure direct communication protocol based on the secret
transmitting order of particles recently proposed by Zhu, Xia, Fan, and Zhang [Phys. Rev. A …

We present a way for entanglement purification based on two parametric down-conversion
(PDC) sources with cross-Kerr nonlinearities. It is comprised of two processes. The first one …

We present two realistic entanglement concentration protocols (ECPs) for pure partially
entangled photons. A partially entangled photon pair can be concentrated to a maximally …

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

We present an efficient quantum repeater protocol that uses coupled systems of quantum-
dot spins and optical microcavities, in which the spatial entanglement of a photon system …

We present two two-step practical entanglement concentration protocols for concentrating
an arbitrary three-particle less-entangled W state into a maximally entangled W state …

We present a nonlocal entanglement concentration scheme for reconstructing some
maximally entangled multipartite states from partially entangled ones by exploiting cross …

In the present paper, a novel bidirectional quantum teleportation protocol is proposed. By
using entanglement swapping technique, two GHZ states are shared as a quantum channel …

A bidirectional quantum controlled teleportation scheme using a seven-qubit maximally
entangled state as quantum channel is proposed. This means that Alice can transmit an …

We propose a scheme for a secure message communication network with authentication
following the idea in controlled teleportation. In this scheme, the servers of the network …