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Naseri M.,Islamic Azad University at Kermanshah | Raji M.A.,Razi University | Hantehzadeh M.R.,Islamic Azad University at Tehran | Farouk A.,Al-Zahra College for Women | And 2 more authors.
Quantum Information Processing | Year: 2015

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 provide the service to prepare the entangled states as quantum channels. For preventing the eavesdropping, a security checking method is suggested. After the security check, any two users in the network may communicate securely and directly under the control of the servers on the network. © 2015, Springer Science+Business Media New York. Source


Batle J.,University of the Balearic Islands | Ooi C.H.R.,University of Malaya | Abutalib M.,King Abdulaziz University | Farouk A.,Al-Zahra College for Women | Abdalla S.,King Abdulaziz University
Quantum Information Processing | Year: 2016

Quantum correlations are almost impossible to address in bulk systems. Quantum measures extended only to a few number of parties can be discussed in practice. In the present work, we study nonlocality for a cluster of spins belonging to a mineral whose structure is that of a quantum magnet. We reproduce at a much smaller scale the experimental outcomes, and then, we study the role of quantum correlations there. A macroscopic entanglement witness has been introduced in order to reveal nonlocal quantum correlations between individual constituents of the azurite mineral at nonzero temperatures. The critical point beyond which entanglement is zero is found at Tc<1K. © 2016, Springer Science+Business Media New York. Source


Batle J.,University of the Balearic Islands | Ooi C.H.R.,University of Malaya | Farouk A.,Al-Zahra College for Women | Abdalla S.,King Abdulaziz University
Quantum Information Processing | Year: 2016

Nonlocality for general multiqubit X states is studied in detail. Pure and mixed states are analyzed as far as their maximum amount of nonlocality is concerned, and analytic results are obtained for important families of these states. The particular form of nonzero diagonal and antidiagonal matrix elements makes the corresponding study easy enough to obtain exact results. We also provide a numerical recipe to randomly generate an important family of X states endowed with a given degree of mixture. © 2015, Springer Science+Business Media New York. Source


Batle J.,University of the Balearic Islands | Ooi C.H.R.,University of Malaya | Farouk A.,Al-Zahra College for Women | Alkhambashi M.S.,Al-Zahra College for Women | Abdalla S.,King Abdulaziz University
Quantum Information Processing | Year: 2016

Quantum correlations are thought to be the reason why certain quantum algorithms overcome their classical counterparts. Since the nature of this resource is still not fully understood, we shall investigate how entanglement and nonlocality among register qubits vary as the Grover search algorithm is run. We shall encounter pronounced differences between the measures employed as far as bipartite and global correlations are concerned. © 2015, Springer Science+Business Media New York. Source


Wang M.-M.,Polytechnic University of Mozambique | Wang M.-M.,Nanjing University of Information Science and Technology | Wang W.,Polytechnic University of Mozambique | Chen J.-G.,Polytechnic University of Mozambique | Farouk A.,Al-Zahra College for Women
Quantum Information Processing | Year: 2015

We study quantum state sharing (QSTS) with noisy environment in this paper. As an example, we present a QSTS scheme of a known state whose information is hold by the dealer and then investigate the noisy influence process of the scheme. Taking the amplitude-damping noise and the phase-damping noise as typical noisy channels, we show that the secret state can be shared among agents with some information lost. Our research connects the areas of quantum state sharing and remote state preparation. © 2015, Springer Science+Business Media New York. Source

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