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Dr. Shahid Iqbal
Assistant Professor
Department of Physics

SNS
National University of Sciences and Technology (NUST)
School of Natural Sciences,H-12, Islamabad, Pakistan
Tel : +92 51 9085 5607

Specialization
Theoretical Quantum Physics

Education
PhD, Physics (QAU, Pakistan)


Education

    PhD 2011 from Quaid-i-Azam University Islamabad, Pakistan.
    MPhil 2005 from  Quaid-i-Azam University Islamabad, Pakistan.
    MSc  2003 from Govt.  College University Lahore, Pakistan.
    BSc 2001 from  Punjab University Lahore, Pakistan.


Teaching and Research Positions
    Assistant Professor, School of Natural Sciences (SNS), National University of Sciences and      
    Technology (NUST), Islamabad, Pakistan, 2012-to-date.
    Assistant Professor, Department of Physics, Govt. College University Lahore, 2009-2012.
    Visiting Scientist at Max-Planck Institute for the Physics of Complex systems, Dresden, Germany, 2008-2009.


Scholarships & Awards
    HEC Indigenous Ph. D Scholarship, Higher Education Commission of Pakistan.
    IRSIP scholarship, Higher Education Commission of Pakistan.
    Visiting Scientist at Max-Planck Institute for the Physics of Complex systems, Dresden, Germany, 2008-2009.
Research Interests:​
 
Quantum Optics: 
Coherent states of harmonic oscillator lie in the core of quantum optics and play an important role in the description of fundamental aspects of light. For instance, the properties of ideal lasers (coherent light without nonlinear effects), such as, sub-Poissonian photon statistics, photon correlation, temporally stable evolution, classical-like phase-space and minimum uncertainty relationship, can be modeled by these coherent states. In the presence of nonlinear medium, the light do not adhere the characteristics of ideal lasers. How can we model the state of light in the presence of nonlinear interaction with media? What kind of characteristics these states exhibit? The focus of our research is to address the various aspects of these issues.
The concept of coherent states can be extended for the general Hamiltonian systems beyond harmonic oscillator and these states are referred to as generalized coherent states. In contrast to the classical-like nature of harmonic oscillator coherent states, generalized coherent states exhibit non-classical characteristics which may model, in some particular situations, the effects of nonlinear interactions of light with media. In our research, we study, i) various approaches to construct the coherent states for general Hamiltonian systems, ii) analyze their properties and iii) their potential applications in various research areas, such as, quantum optics (as mentioned above), quantum information and related areas.
 
Quantum Information:
The beam splitters and quantum interferometers played an important role in understanding the quantum nature of light, both from theoretical as well as experimental point of view. In the context of quantum information theory, the study of engineering and dynamics of entangled states at the outputs of these devices, in response to various quantum states applied at input, exhibit very interesting implications. In order to generate the entangled states at output, the nonclassical nature of the input state is essentially required.
In our research, we study the entanglement generation using various nonclassical states, such as, generalized coherent states of various kinds, squeezed coherent states, Fock states, displaced Fock states etc., as input state. Moreover, we study the dynamical and decoherence effects for these entangled states.
 
Quantum Chaos:
The quantum chaos deals with quantum dynamics of classically chaotic systems. It exhibits very fascinating phenomena, such as, dynamical localization, chaos assisted tunneling, nondispersive dynamics and quantum recurrence. A periodically driven one-dimensional system may exhibit chaotic dynamics in classical domain and therefore serves as a testing ground for quantum chaos.
In our research we study the periodically driven power-law potentials and explore the various phenomena of quantum chaos. In particular, we solve the time-dependent Schrödinger equation, analytically, corresponding periodically driven systems using secular perturbation theory. Under this approximation, the time dependent-Schrödinger equation is mapped into a Mathieu equation whose solutions are well-known in terms of Mathieu functions. In this way we find the quasi-eigenvalues and Eigen functions and study the phenomenon of quantum revivals. Moreover, we solve the dependent-Schrödinger equation of the system numerically, and verify our analytically obtained results. Furthermore, we probe the signatures of non-dispersive dynamics both analytically and numerically.
 
Research Students:
 
 
PhD Students
  1. Hadiah Bint Monir (Nonclassical Coherent states and their applications to quantum information)
MPhil
  1. Iqra Yousaf (Atto second wave packet dynamics)
  2. Bushra Tabassam (Entangled composite bosons)
  3. Madiha Latif (Quantum Information Processing by Continous Variables)
  4. Sunia Javed (Entanglement generation in optical lattices)

 

Graduated Students:

PhD
 
  1. Naila Amir (On the solutions of position-dependent effective mass systems and associated coherent states)​
Mphil
 
  1. Usama Zaheer (Dynamical Behavior of the Morse Oscillator: The Coherent State Approach)
  2. Sara Midhat (Dynamics of Coherent State Wave Packets in Gravitational Cavity)
  3. Hadia Mushtaq (Entropic measurements of dynamical quantum systems)
  4. Nasim Bibi (Entanglement of Barut-Girardello coherent states by optical beam splitters)

​Research Publications: 

 

​S/No ​Descriptions
1. Ladder operators and associated algebra for position-dependent effective mass systems Naila Amir and Shahid Iqbal, Europhysics Letters 111 (2015) 20005.

​2.

Coherent states of nonlinear harmonic oscillator and some of their properties Naila Amir and Shahid Iqbal, J. Math. Phys. 56 (2015) 062108.​
​3. Exact Solutions of Schrodinger Equation for the Position-Dependent Effective Mass Harmonic Oscillator, Naila Amir and Shahid Iqbal, Commun. Theor. Phys.  62 (2014) 790.
​4. Comment on 'Coherent states for the nonlinear harmonic oscillator', Naila Amir and Shahid Iqbal, J. Math. Phys.  55 (2014) 114101.
​5. Electronic excitation by short X-ray pulses: from quantum beats to wave packet revivals, Paula Reviere, Shahid Iqbal, and JM Rost, J. Phys. B: At. Mol. & Opt. Phys. 47 (2014) 124039
​6. Comment on '“stringy” coherent states inspired by the generalized uncertainty principle', Shahid Iqbal, Phys. Lett. B  725 (2013) 487.
​7. Gazeau-Klauder Coherent States of Triangular Well Potential, Shahid Iqbal and Farhan Saif, J. Russ. Laser Res. 34 (2013) 77.
​8. Comment on 'Generalized Heisenberg algebra coherent states for power-law potentials', Shahid Iqbal and Farhan Saif, Phys. Lett. A 377 (2012) 1531.
​9. Generalized coherent states and their statistical characteristics in power-law potentials, Shahid Iqbal and Farhan Saif, J. Math. Phys. 52  (2011) 082105.
​10. Space-time Dynamics of Gazeau-Klauder Coherent States for Power-law Potentials, Shahid Iqbal, Paula Riviere and Farhan Saif, Int. J. Theor. Phys. 49 (2010) 2540.
​11. ​Presentation, in the 4th International Symposium on Quantum Optics (August 2009), COMSATS Islamabad, entitled “non-classical properties of generalized coherent states”.
​12. Quantum computation with particle in a driven square well, Shahid Iqbal and Farhan Saif, J. Russ. Laser Res. 29 (2008) 466.
​13. ​​Quantum Recurrences in Driven Power-law Potentials, Shahid Iqbal, Qurat-ul-Ann and Farhan Saif, Phys. Lett.  A, 356 (2006) 231



 

Preprints: 

 
​S/No ​Descriptions
​1. Construction of Barut-Girardello coherent states of position-dependent mass oscillator Naila Amir and Shahid Iqbal, (submitted).
​2. ​Generalized algebra and associated coherent states for position-dependent effective mass systems Naila Amir and Shahid Iqbal, (Submitted)
​3. ​Algebraic solutions of nonlinear harmonic oscillator with position-dependent effective mass Naila Amir and Shahid Iqbal, (submitted)​

 

Conferences and Workshops:

​S/No ​Descriptions
​1. Oral presentation, in International Scientific Spring-15, (March 16-20, 2015) National Center for Physics, Islamabad, entitled “temporal evolution of coherent states for position-dependent effective mass systems”.
​2. Oral & poster presentation, in Winter College on Optics, Light: A Bridge between Earth and Space (February 9-20, 2015), International Center for Theoretical Physics (ICTP), Trieste, Italy. entitled “coherent states of nonlinear harmonic oscillator and nonclassical light”,
​3. Participated, in Celebration International Year of Light (February 2-3 2015) National Center for Physics, Islamabad, Pakistan.
​4. Oral presentation, Complex Nonlinear Systems: From Basic Science to Applications, (October 7-11, 2013) Samarkand, Uzbekistan, entitled “spatio-temporal dynamics of generalized coherent state wave packets”.
​5. Presentation, in the 6th International Symposium on Quantum Optics (August 2011), COMSATS Islamabad, entitled “non-classicality criteria for generalized coherent states and their applications to entanglement generation”.
​6. Presentation, in the 4th International Symposium on Quantum Optics (August 2009), COMSATS Islamabad, entitled “non-classical properties of generalized coherent states”.
​7. Attended the 31st International Nathiagali Summer college on Physics and Contemporary Needs (June 26- July 8, 2006).
​8. Attended the “9th Symposium Frontiers in Physics” at G. C. University Lahore, Pakistan on January,  2003.​
Courses Taught:
 
PG Courses
     Quantum Mechanics
     Quantum Dynamics
     Introduction to Quantum Optics
     Optomechanics
 
UG Courses
     Quantum Mechanics
     Mathematical Methods in Physics
     Signals and Systems
     Digital Signal Processing
     Quantum Computation