Seminar organised by WN and TQC

Subject : Propagation of single-excitation quantum states through spin chains and James-Cummings-Hubbard arrays

Speaker: Prof. Dr. Ranabir Chakrabarti, Department of Theoretical Physics, University of Madras

Abstract:

 It is intended to discuss the time-dependent correlation function describing the evolution of a single excitation state on a linear spin chain with isotropic nearest-neighbor XY coupling, where the Hamiltonian is related to the Jacobi matrix of a set of orthogonal polynomials. For instance, in the case of Krawtchouk polynomial, an arbitrary element of

the correlation function can be calculated in closed form showing exact transmission of the state at pre-prescribed time. A similar problem is studied in the context of an one-dimensional array of the James-Cummings-Hubbard system of arbitrary number of coupled cavities, each containing a two-level atom that interacts with a field mode.

References:

1) R. Chakrabarti and J. Van der Jeugt, J. Phys. A 43, 085302 (2010)

2) R. Chakrabarti and G. Sreekumari, J. Phys. B 44, 115505 (2011)

When and where: Wednesday, June 6, 2012 at 16 h  in room N.008, Campus Drie Eiken