The effect of classical noise on a quantum two-level system Jean-Philippe Aguilar and Nils Berglund We consider a quantum two-level system perturbed by classical noise. The noise is implemented as a stationary diffusion process in the off-diagonal matrix elements of the Hamiltonian, representing a transverse magnetic field. We determine the invariant measure of the system and prove its uniqueness. ... [J. Math. Phys. 49, 102102 (2008)] published Fri Oct 3, 2008. Asymptotic performance of optimal state estimation in qubit system Masahito Hayashi and Keiji Matsumoto We derive an asymptotic bound for the error of state estimation when we are allowed to use the quantum correlation in the measuring apparatus. It is also proven that this bound can be achieved in any statistical model in the qubit system. Moreover, we show that this bound cannot be attained by any q ... [J. Math. Phys. 49, 102101 (2008)] published Thu Oct 2, 2008. Nonlinear scattering for a system of nonlinear Klein--Gordon equations Nakao Hayashi, Pavel I. Naumkin, and Ratno Bagus Edy Wibowo We consider the initial value problem for systems of nonlinear KleinGordon equations with quadratic nonlinearities. We prove the existence of scattering states, namely, the asymptotic stability of small solutions in the neighborhood of the free solutions for small initial data in the weighted Sobole ... [J. Math. Phys. 49, 103501 (2008)] published Wed Oct 1, 2008.
Five Trends in Automated Test - Sponsored link Mon, 02 Jun 2008 09:00:00 -0500 Learn about five key trends that affect the way you develop tests, both today and in the future. View video. The larger world of nano Wed, 01 Oct 2008 08:00:00 -0500 Research in the social sciences and humanities can help scientists and policymakers
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