Al-Zahra College for Women
Muscat, Oman
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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.

Batle J.,University of the Balearic Islands | Abutalib M.,King Abdulaziz University | Abdalla S.,King Abdulaziz University | Farouk A.,Al-Zahra College for Women
International Journal of Quantum Information | Year: 2016

The transmission of pure and mixed states along a quantum spin chain is investigated. Nonlocality between two qubits will evolve as it is transmitted through the quantum channel in a way that may violate or not the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality at different times. This violation of local realism is analogue to the so-called sudden death and sudden birth features of entanglement. In the quantum channel, which will turn to be a damping one, some (mixed) states will be preferred according to the nature of the quantum correlations that are preserved during the evolution along the spin chain. © 2016 World Scientific Publishing Company.

Saleem A.,Sultan Qaboos University | Al Ratrout S.,Al-Zahra College for Women | Wong C.B.,Connected Living
International Journal of Modelling, Identification and Control | Year: 2017

Modelling and control of pneumatic systems are tedious and difficult because of the inherent nonlinearity associated with these systems. In this paper, a component-based modelling approach is proposed to create a nonlinear mathematical model of servo-pneumatic systems. According to the proposed modelling approach, the system is decomposed into the main components, the linkage nature between components is identified, and the model of each component is created separately. A generalised nonlinear model of pneumatic system is created by simply aggregating the model of the separate components. This model is then validated using a real pneumatic system available in De Montfort University labs. Experimental results show that real and simulated responses agreed well. Afterward, the developed model is used to design and tune PID-based controller using two different methods. Both controllers have been tested on the real system through hardware-in-the-loop (HIL). Experimental results show that both controllers succeeded to follow a reference speed profile. The proposed approach should lead to reduction in model complexity, faster model formulation, and high model accuracy and reliability. Copyright © 2017 Inderscience Enterprises Ltd.

Batle J.,University of the Balearic Islands | Alkhambashi M.,Al-Zahra College for Women | Farouk A.,Al-Zahra College for Women | Naseri M.,Islamic Azad University at Kermānshāh | Ghoranneviss M.,Islamic Azad University at Tehran
European Physical Journal B | Year: 2017

Quantum correlation measures are limited in practice to a few number of parties, since no general theory is still capable of reaching the thermodynamic limit. In the present work we study entanglement and non-locality for a cluster of spins belonging to a compound that displays a magnetocaloric effect. A quantum phase transition (QPT) is induced by an external magnetic field B, in such a way that the corresponding quantum fluctuations are reproduced at a much smaller scale than the experimental outcomes, and then described by means of the aforementioned quantum measures. © 2017, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.

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 | 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.

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