Al-Zahra College for Women

www.zcw.edu.om
Muscat, Oman

Time filter

Source Type

Batle J.,University of the Balearic Islands | Farouk A.,Mansoura University | Alkhambashi M.,Al-Zahra College for Women | Abdalla S.,King Abdulaziz University
European Physical Journal B | Year: 2017

Quantum correlations are generally impossible to address directly in bulk systems. Quantum measures extended only to a few number of parties can be discussed in practice. In the present work we study a cluster of spins belonging to a compound 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 quantum correlations at nonzero temperatures. The critical point beyond which entanglement is zero is found at Tc = 15 K. © 2017, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.


Abdolmaleky M.,Islamic Azad University at Kermānshāh | Naseri M.,Islamic Azad University at Kermānshāh | Batle J.,University of the Balearic Islands | Farouk A.,Al-Zahra College for Women | Gong L.-H.,Nanchang University
Optik | Year: 2017

A new quantum multi-channel Red-Green-Blue (RGB) representation for digital images including the preparation and retrieving procedure is proposed. In our method, the images are represented by using two entangled qubit sequences where the first sequence are employed to encode the RGB color information of the pixel and the second one denotes the position of it. The potential applications of the proposed representation, which introduces some useful quantum image processing operators is discussed and supported by software simulations. © 2016 Elsevier GmbH


Batle J.,University of the Balearic Islands | Naseri M.,Islamic Azad University at Kermānshāh | Ghoranneviss M.,Islamic Azad University at Tehran | Farouk A.,Mansoura University | And 2 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2017

It is a well-known fact that both quantum entanglement and nonlocality (implied by the violation of Bell inequalities) constitute quantum correlations that cannot be arbitrarily shared among subsystems. They are both monogamous, albeit in a different fashion. In the present contribution we focus on nonlocality monogamy relations such as the Toner-Verstraete, the Seevinck, and a derived monogamy inequality for three parties and compare them with multipartite nonlocality measures for the whole set of pure states distributed according to the Haar measure. In this numerical endeavor, we also see that, although monogamy relations for nonlocality cannot exist for more than three parties, in practice the exploration of the whole set of states for different numbers of qubits will return effective bounds on the maximum value of all bipartite Bell violations among subsystems. Hence, we shed light on the effective nonlocality monogamy bounds in the multiqubit case. © 2017 American Physical Society.


Zhou N.R.,Shanghai JiaoTong University | Liang X.R.,Nanchang University | Zhou Z.H.,Shanghai JiaoTong University | Farouk A.,Al-Zahra College for Women
Security and Communication Networks | Year: 2016

Cooperative communication can improve the performance of communication system under multi-path fading conditions by relaying. If there is an eavesdropper in communication system, the secrecy capacity of the system will decrease. Sending artificial noise can enhance the secrecy capacity of communication system. A novel scheme combining relay selection with artificial noise for amplify-and-forward cooperative communication system in the presence of an eavesdropper is designed, which seeks the relay with the highest signal-to-noise ratio. The location of optimal relay node is found out in this scheme by the relay selection scheme based on distance. However, there is not always a relay node at the optimal location. If there is no relay at the optimal location, then the suboptimal relay node can be found out by drawing circles centered on the optimal location. After that, the optimal relay forwards the signals and sends the artificial noise in the null space of the legitimate channel to confuse the eavesdropper. A close-form expression for maximizing the secrecy capacity is derived, and it is used as the objective function to select the optimal or suboptimal relay node. The algorithm complexity of the relay selection scheme based on distance is lower than that of the relay selection scheme based on instantaneous channel states. Moreover, it can achieve higher secrecy capacity compared with the scheme without artificial noise. Simulations are conducted to validate the theoretical analyses, and the results demonstrate the validity and reliable security of the scheme. © 2016 John Wiley & Sons, Ltd.


Metwaly A.F.,Al-Zahra College for Women | Rashad M.Z.,Mansoura University | Omara F.A.,Cairo University | Megahed A.A.,Cairo University
European Physical Journal: Special Topics | Year: 2014

Multicasting refers to the transmission of a message or information from one sender to multiple receivers simultaneously. Although encryption algorithms can be used to secure transmitted messages among group members, still there are many security aspects for designing a secured multicast cryptosystem. The most important aspects of Multicasting are key generation and management. The researchers have proposed several approaches for solving problems of multicast key distribution and management. In this paper, a secure key generation and distribution solution has been proposed for a single host sending to two or more (N) receivers using centralized Quantum Multicast Key Distribution Centre "QMKDC" and classical symmetric encryption. The proposed scheme uses symmetric classical algorithms for encryption and decryption transmitted messages among multicast group members, but the generated keys which are used for authentication, encryption and decryption also play an important role for designing a secured multicast cryptosystem come from QKD protocols. Authentication verified using EPR entangled Photons and controlled-NOT gate. Multiple requests for initialization as well for transmitting sensitive information handled through priority and sensitivity levels. Multiple members' communication is achieved with full or partial support of QMKDC. © 2014 EDP Sciences and Springer.


PubMed | Al-Zahra College for Women, Mansoura University and Cairo University
Type: | Journal: Scientific reports | Year: 2015

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 u1, u2, , uN-1 can transmit a secret message of classical bits to a remote user uN by utilizing the property of dense coding and Pauli unitary transformations. The authentication process between the quantum server and the users are validated by EPR entangled pair and CNOT gate. Afterwards, the remained EPR will generate shared GHZ states which are used for directly transmitting the secret message. The partial cooperation process indicates that N - 1 users can transmit a secret message directly to a remote user uN through a quantum channel. Furthermore, N - 1 users and a remote user uN can communicate without an established quantum channel among them by a full cooperation process. The security analysis of authentication and communication processes against many types of attacks proved that the attacker cannot gain any information during intercepting either authentication or communication processes. Hence, the security of transmitted message among N users is ensured as the attacker introduces an error probability irrespective of the sequence of measurement.


Al-Ratrout S.,Al-Zahra College for Women | Saleem A.,Sultan Qaboos University | Soliman H.,Sultan Qaboos University
ISMA 2015 - 10th International Symposium on Mechatronics and its Applications | Year: 2015

This paper presents a comparative study on the optimization methods in fractional PID controller design for induction motor. Choosing the best optimization algorithm for tuning fractional order controllers is crucial in order obtain best system response. In this study genetic algorithm, local search, nonlinear sequential quadratic programming, and particle swarm optimization algorithms are used to tune a fractional PI controller for induction motors. A model of a real motor is used to design and test the controllers. The resulted fractional controllers are approximated using refined Oustaloup's recursive filter in order to be implemented using digital controllers. The controllers' speed tracking performance is tested in simulation and a comparative analysis has been conducted. © 2015 IEEE.


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.


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.


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.

Loading Al-Zahra College for Women collaborators
Loading Al-Zahra College for Women collaborators