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10 papers · 2 filters
Collective Rydberg excitations of an atomic gas confined in a ring lattice
B. Olmos, R. González-Férez, I. Lesanovsky
We study the excitation dynamics of Rydberg atoms in a one-dimensional lattice with periodic boundary conditions where the atomic Rydberg states are resonantly excited from the ele…
Towards a dynamical theory of observation
George Jaroszkiewicz
We introduce a model of classical and quantum observation based on contextuality and dynamically evolving apparatus. Power sets of classical bits model the four classical states of…
The importance of an accurate target wave function in variational calculations for (e^{+}-H_{2}) scattering
J. N. Cooper, E. A. G. Armour, M. Plummer
Using the complex Kohn method, we have calculated variational values of phase shifts and the annihilation parameter, Z_{eff}, for the elastic scattering of positrons by molecular h…
A perturbative approach to inelastic collisions in a Bose-Einstein Condensate
R. B. Mann, M. B. Young, I. Fuentes-Schuller
It has recently been discovered that for certain rates of mode-exchange collisions analytic solutions can be found for a Hamiltonian describing the two-mode Bose-Einstein condensat…
Optimal estimation of losses at the ultimate quantum limit with non-Gaussian states
G. Adesso, F. Dell'Anno, S. De Siena +2
We address the estimation of the loss parameter of a bosonic channel probed by arbitrary signals. Unlike the optimal Gaussian probes, which can attain the ultimate bound on precisi…
Dynamical programming of continuously observed quantum systems
Viacheslav P. Belavkin, Antonio Negretti, Klaus Molmer
We develop dynamical programming methods for the purpose of optimal control of quantum states with convex constraints and concave cost and bequest functions of the quantum state. W…