Papers by Mostafa Mansour
arXiv (Cornell University), Oct 31, 2022
Spin qubits are at the heart of technological advances in quantum processors and offer an excelle... more Spin qubits are at the heart of technological advances in quantum processors and offer an excellent framework for quantum information processing. This work characterizes the time evolution of coherence and nonclassical correlations in a two-spin XXZ Heisenberg model, from which a two-qubit system is realized. We study the effects of intrinsic decoherence on coherence (correlated coherence) and nonclassical correlations (quantum discord ), taking into consideration the combined impact of an external magnetic field, Dzyaloshinsky-Moriya (DM) and Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) interactions. To fully understand the effects of intrinsic decoherence, we suppose that the system can be prepared in one of the two well-known extended Werner-like (EWL) states. The findings show that intrinsic decoherence leads the coherence and quantum correlations to decay and that the behavior of the aforementioned quantum resources relies strongly on the initial EWL state parameters. We, likewise, found that the two-spin correlated coherence and quantum discord; become more robust against intrinsic decoherence depending on the type of the initial state. These outcomes shed light on how a quantum system should be engineered to achieve quantum advantages.
Overview on Quantum Programming
Annalen der Physik
Studying quantum properties in solid-state systems is a significant avenue for research. In this ... more Studying quantum properties in solid-state systems is a significant avenue for research. In this scenario, double quantum dots (DQDs) appear as a versatile platform for technological breakthroughs in quantum computation and nanotechnology. This work inspects the thermal entanglement and quantum coherence in two-coupled DODs, where the system is exposed to an external stimulus that induces an electronic transition within each subsystem. The results show that the introduction of external stimulus induces a quantum level crossing that relies upon the Coulomb potential changing the degree of quantum entanglement and coherence of the system. Thus, the quantum properties of the system can be tuned by changing the transition frequency, leading to the enhancement of its quantum properties.
Non-classical Correlations in Multipartite Generalized Coherent States
Brazilian Journal of Physics
Intrinsic decoherence effects on quantum correlations dynamics
Optical and Quantum Electronics, 2022
We investigate the influence of intrinsic decoherence on the quantum correlations in a two-qubit ... more We investigate the influence of intrinsic decoherence on the quantum correlations in a two-qubit Heisenberg XYZ spin chain in the presence of the z -component of Dzyaloshinskii–Moriya interaction by employing logarithmic negativity and trace distance discord as reliable quantum correlation quantifiers. We highlight the dynamics behaviours of suggested quantifiers for a system initially prepared in the extended Werner-like state. For an initial separable state, it is found that the robustness and the generation of the quantum correlations depend on the physical parameters. While considering the entangled state as an initial state, the results show that despite the phase decoherence, all the correlations reach their steady state values after exhibiting some oscillations. We reveal that TDD is relatively more robust against the intrinsic decoherence compared to the logarithmic negativity and increasing the intrinsic decoherence rate leads to a drastic decrease of the quantum correlations between the two qubits.
Using the splitting of a Q-deformed boson, in the Q → q = e 2πi k limit, the fractional decomposi... more Using the splitting of a Q-deformed boson, in the Q → q = e 2πi k limit, the fractional decomposition of the quantum affine algebrâ A(n) and the quantum affine super-algebrâ A(n, m) are found. This decomposition is based on the oscillator representation and can be related to the fractional supersymmetry and k-fermionic spin. We establish also the equivalence between the quantum affine algebrâ A(n) and the classical one in the fermionic realization.
International Journal of Modern Physics B, 2019
Coherence arises from the superposition principle, where it plays a central role in quantum mecha... more Coherence arises from the superposition principle, where it plays a central role in quantum mechanics. In Phys. Rev. Lett. 114, 210401 (2015), it has been shown that the freezing phenomenon of quantum correlations beyond entanglement is intimately related to the freezing of quantum coherence (QC). In this paper, we compare the behavior of entanglement and quantum discord with quantum coherence in two different subsystems (optical and mechanical). We use respectively the entanglement of formation (EoF) and the Gaussian quantum discord (GQD) to quantify entanglement and quantum discord. Under thermal noise and optomechanical coupling effects, we show that EoF, GQD and QC behave in the same way. Remarkably, when entanglement vanishes, GQD and QC remain almost unaffected by thermal noise, keeping nonzero values even for high-temperature, which is in concordance with Phys. Rev. Lett. 114, 210401 (2015). Also, we find that the coherence associated with the optical subsystem is more robust...
Egyptian Dental Journal
Introduction: Saliva plays a key role in the oral cavity health. It contains many defense element... more Introduction: Saliva plays a key role in the oral cavity health. It contains many defense elements and is considered a cornerstone in the oral metabolism. Objective: The aim of this study was to investigate the changes in the salivary concentrations of calcium, glucose, total protein, lactate dehydrogenase and alkaline phosphatase in patients undergoing removable orthodontic appliances treatment. Methods: Ninety saliva samples were collected from thirty subjects ranging in age from 8 to 11 years. An initial sample was attained before starting treatment with removable orthodontic appliances; a second sample 1 month after treatment and a third sample was obtained three months following treatment. The saliva was collected from each patient in pre-labeled sterile containers using the passive drool method. Results: Salivary lactate dehydrogenase and alkaline phosphatase concentrations were significantly increased in patients undergoing removable orthodontic treatment after as compared to before treatment. There was also an increase in the calcium, glucose and total protein concentrations but the differences were insignificant. Conclusion: Removable orthodontic treatment changes the oral fluid contents, promotes an increase in the levels of salivary lactate dehydrogenase and alkaline phosphatase enzymes after one month of treatment with increased values after three months. These oral changes emphasize the importance of maintaining proper oral hygiene measures during treatment.
Entanglement of bipartite partly non-orthogonal $\frac{1}{2}$-spin coherent states
Laser Physics
Egyptian Dental Journal
Introduction: Saliva has been considered a valuable diagnostic tool for many disorders and diseas... more Introduction: Saliva has been considered a valuable diagnostic tool for many disorders and diseases. Objective: The aim of this study was to assess some important biomarkers of oxidative stress in the saliva of patients undergoing fixed orthodontic treatment. Methods: A total of thirty three subjects (18 females and 15 males) in the age group of 15-18 years were enrolled in the study. The salivary samples were collected before fixed appliance placement, 6 months and 1 year after orthodontic treatment onset. Samples were investigated for measurement of malondialdehyde (MDA), nitric oxide (NO) and 8-hydroxydeoxyguanosine (8-OHdG) levels. Results: The salivary MDA, NO and 8-OHdG concentrations in the individuals treated with fixed orthodontic appliances did not show significant changes neither after 6 nor after 12 months of treatment compared to the basal values before treatment. Conclusion: Fixed orthodontic therapy for one year did not induce oxidative damage in the oral cavity.
Remote Sensing
Binocular disparity and motion parallax are the most important cues for depth estimation in human... more Binocular disparity and motion parallax are the most important cues for depth estimation in human and computer vision. Here, we present an experimental study to evaluate the accuracy of these two cues in depth estimation to stationary objects in a static environment. Depth estimation via binocular disparity is most commonly implemented using stereo vision, which uses images from two or more cameras to triangulate and estimate distances. We use a commercial stereo camera mounted on a wheeled robot to create a depth map of the environment. The sequence of images obtained by one of these two cameras as well as the camera motion parameters serve as the input to our motion parallax-based depth estimation algorithm. The measured camera motion parameters include translational and angular velocities. Reference distance to the tracked features is provided by a LiDAR. Overall, our results show that at short distances stereo vision is more accurate, but at large distances the combination of pa...
Nephrology Dialysis Transplantation
K-Uniform Maximally Mixed States from Multi-Qudit Phase States
Modern Physics Letters A
This paper concerns the construction of k-uniform maximally mixed multipartite states by using th... more This paper concerns the construction of k-uniform maximally mixed multipartite states by using the formalism of phase states for finite dimensional systems (qudits). The k-uniform states are a special kind of entangled (n)-qudits states, such that after tracing out arbitrary (n[Formula: see text]k) subsystems, the remaining (k) subsystems are maximally mixed. We recall some basic elements about unitary phase operators of a multi-qudit system and we give the corresponding separable density matrices. Evolved density matrices arise when qudits of the multipartite system are allowed to interact via an Hamiltonian of Heisenberg type. The expressions of maximally mixed states are explicitly derived from multipartite evolved phase states and their properties are discussed.
Stabilizer codes and equientangled bases from phase states
International Journal of Modern Physics B, 2017
We develop a comprehensive approach of stabilizer codes and provide a scheme generating equientan... more We develop a comprehensive approach of stabilizer codes and provide a scheme generating equientangled basis interpolating between the product basis and maximally entangled basis. The key ingredient is the theory of phase states for finite-dimensional systems (qudits). In this respect, we derive entangled phase states for a multiqudit system whose dynamics is governed by a two-qudit interaction Hamiltonian. We construct the stabilizer codes for this family of entangled phase states. The stabilizer phase states are defined as the common eigenvectors of the stabilizer group generators which are explicitly specified. Furthermore, we construct equally entangled bases from bipartite as well as multipartite entangled qudit phase states.
A safe swinging method and device for accurate playing and training of swinging sports such as golf, baseball, hockey, cricket, tennis, racquetball, and squash
Entanglement of spin coherent mixed states
International Journal of Quantum Information, 2016
In this paper, we quantify the amount of entanglement of bipartite mixed states represented by a ... more In this paper, we quantify the amount of entanglement of bipartite mixed states represented by a statistical mixture of the more general type of two-qubit non-orthogonal states of the form: [Formula: see text], constructed by linearly independent spin coherent states. We use the concurrence as a measure of entanglement and we study its behavior in terms of the amplitudes of SU(2) coherent states.
Threading model optimization of the AEMB Microprocessor
Entanglement from Quantization-Deformation
In this paper we introduce the unitary solutions of the Quantum Yang–Baxter Equation derived via ... more In this paper we introduce the unitary solutions of the Quantum Yang–Baxter Equation derived via the quantization-deformation of a Poisson Lie group associated to an r-matrix (solution of a classical Yang Baxter equation). The solutions of the algebraic and braided Quantum Yang Baxter equations that we explore contains a deformation parameter , and will be used to perform quantum entanglement when acting on bipartite quantum states.
On the Quantum Virasoro Algebra
Acta Physica Slovaca
We give the quantum algebra structure on the q and (pq) deformed Virasoro algebra with its realiz... more We give the quantum algebra structure on the q and (pq) deformed Virasoro algebra with its realization in term of the infinite matrix algebra elements.
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Papers by Mostafa Mansour