Speaker: Jean-Pierre Gazeau (Laboratoire APC, University Paris Diderot)

Title of the talk: Finite dimensional Hilbert space and frame quantization
(based on a paper with N. Cotfas and A. Vourdas, to appear in J. Phys. A (2011))

Abstract: The quantum observables used in the case of quantum systems with finite-dimensional Hilbert space are defined either algebraically in terms of an orthonormal basis and discrete Fourier transformation or by using a continuous system of coherent states. We present an alternative approach to these important quantum systems based on the finite frame quantization. Finite systems of coherent states, usually called finite tight frames, can be defined in a natural way in the case of finite quantum systems. Novel examples of such tight frames are presented. The quantum observables used in our approach are obtained by starting from certain classical observables described by functions defined on the discrete phase space corresponding to the system. They are obtained by using a finite frame and a Klauder-Berezin-Toeplitz type quantization.