Professor of Systems and Control
My current research
is focussed on problems at the interface of physics and
control. A fundamental problem in coherent spectroscopy and quantum
information science is to find limits on how close can an open quantum
dynamical system be driven to a target state in the presence of
dissipation and decoherence and what is the optimal excitation that
achieves this objective. We are studying these problems in the context
of design of multidimensional NMR experiments that maximize the
efficiency of transfer of coherence between coupled spins in the
presence of decoherence and optimize the sensitivity of these
experiments. Other projects include development of novel radio frequency
pulse sequences for time optimal control of coupled spin systems with
applications in spectroscopy and quantum informaion processing. Problems
in robust control of spin systems, that are immune to parametric
inhomogeneties in system dynamics. In
recent years, we have also worked in development of new methods in
high resolution nuclear magnetic resonance spectroscopy in solution and
solids. The work has an important collaborative experimental
component. Some past projects involve feedback stabilization of
nonholonomic systems and problems in machine intelligence and
N. Khaneja, "Squid Magnetometers, josephson junctions, confinement and BCS theory of superconductivity " Magnetometers - Fundamentals and Applications of Magnetism DOI: 10.5772/intechopen.83714 (2019) https://www.intechopen.com/online-first/squid-magnetometers-josephson-junctions-confinement-and-bcs-theory-of-superconductivity
N. Khaneja, "Magnetic resonance with number states vs coherent states" International Journal of modern Physics B (2018) https://doi.org/10.1142/S0217979218503368
N. Khaneja, "Convexity, Majorization and Time Optimal Control of Coupled Spin Dynamics" Applied Modern Control Intech, Open (2018) https://cdn.intechopen.com/pdfs/63378.pdf
N. Khaneja, "Conservation of Energy, Density of States and Spin Lattice relaxation" Concepts in Magnetic Resonance: Part A (2018); 46A:e21457.
N. Khaneja, "Chirp Mixing" Chemical Physics Letters 704, 62-67 (2018)
N. Khaneja, "Electron dynamics in solid state via time varying wavevectors" Physica B 539, 29-34 (2018).
N. Khaneja, "Chirp excitation" Journal of Magnetic Resonance 282, 32-36 (2017).
N. Khaneja and A. Kumar, "Two Pulse Recoupling" Journal of Magnetic Resonance 281, 162-171 (2017).
N. Khaneja and A. Kumar, "Broadband excitation by method of double sweep", Applied Magnetic Resonance 48(8), 771-782 (2017).
N. Khaneja "Rf-inhomogeneity compensation using method of Fourier synthesis" Journal of Magnetic Resonance, 277, 113-116 (2017).
N. Khaneja "Cone separation, quadratic control systems and control of spin dynamics in presence of decoherence", Phil. Tran. R. Soc. A , 375, (2017).
N. Khaneja and A. Kumar, "Four Pulse Recoupling" Journal of Magnetic Resonance 272, 158-165 (2016).
N. Khaneja and A. Kumar, "Recoupling Pulse Sequences with Constant Phase Increments" Journal of Magnetic Resonance 271, 75-82 (2016).
Van Koroleva and N. Khaneja "Homonuclear decoupling for liquid-state NMR" Journal of Chemical Physics, 137, 094103 (2012).
H. Arthnari, G. Wagner and N. Khaneja "`Heteronuclear Decoupling by Multiple Rotating Frame Technique" Journal of Magnetic Resonance, 209, 8-18 (2011).
N. Khaneja and N.C. Nielsen "Triple oscillating field technique for accurate measurement of internuclear distances by solid state NMR spectroscopy" Journal of Chemical Physics, 128, 015103 (2008).
N. Khaneja "Switched Control of Electron Nuclear Spin Systems " Phys. Rev. A , 76, 032326 (2007) .
N. Khaneja, C. Kehlet, S.J. Glaser and N.C. Nielsen " Composite dipolar recoupling: Anisotropy compensated coherence transfer in solid-state nuclear magnetic resonance " Journal of Chemical Physics vol. 124, 114503 (2006).
Physics and Control Handouts:
Quantum Control Handouts:
Solid State Systems and Control