Cover illustrations: TOP LEFT: Ordered lubricants confined to nanoscale gap (Peter Cummings). BOTTOM LEFT: Hypothetical spintronic quantum computer (Sankar Das Sarma and Bruce Kane). TOP RIGHT: Folded spectrum method for free-standing quantum dot (Alex Zunger). MIDDLE RIGHT: Equilibrium structures of bare and chemically modified gold nanowires (Uzi Landman).

Jesper Goor Pedersen,1,2 Aron W. Cummings,2 and Stephan Roche2,3 1DTU Nanotech–Department of Microand Nanotechnology, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark 2Institut Català de Nanociència i Nanotecnologia (ICN2), Campus de la UAB, Edifici ICN2, 08193 Bellaterra, Barcelona, Spain 3ICREA Institucio Catalana de Recerca i Estudis Avancats, 08010 Barcelona, Spain (Received 30...

We consider a class of unbounded self-adjoint operators including the Hamiltonian of the Jaynes-Cummings model without rotating-wave approximation (RWA). The corresponding operators are defined by infinite Jacobi matrices with discrete spectrum. Our purpose is to give an asymptotic description of large eigenvalues.

We answer a question of Cummings and Magidor by proving that the P-ideal dichotomy of Todorčević refutes κ,ω for any uncountable κ. We also show that the P-ideal dichotomy implies the failure of κ, ω1.

We develop a version of Namba forcing which is useful for constructing models with no good scale on אω . A model is produced in which אn holds for all finite n ≥ 1, but there is no good scale on אω ; this strengthens a theorem of Cummings, Foreman, and Magidor [3] on the non-compactness of

In this letter the explicit form of evolution operator of the Tavis–Cummings model with three and four atoms is given. This is an important progress in quantum optics or mathematical physics. The purpose of this paper is to give an explicit form to the evolution operator of Tavis–Cummings model ([1]) with some atoms. This model is a very important one in Quantum Optics and has been studied wide...

Abstract The quantum Rabi model in the adiabatic and ultrastrong deep strong coupling regimes is considered. Some of differences with Jaynes-Cummings are illustrated by considering evolution states expected values root-mean-square deviations several physical quantities qubit-oscillator system.

We study the phenomenon of localization and delocalization in a circuit-QED network with connectivity varying from finite-range coupling to all-to-all coupling. find fascinating interplay between interactions connectivity. In particular, we consider (i) harmonic, (ii) Jaynes-Cummings, (iii) Bose-Hubbard networks. start initial condition where one nodes is populated then let it evolve time. The ...

Context The focus of the study is on nursing leadership and its association to patient mortality. Cummings and colleagues state in the introduction that the relationship between nursing leadership styles in hospitals and patient outcomes has not been explored in many studies. The authors discuss the infl uence of different nursing leadership styles, such as taskand relationship-focused, emotion...

We investigate the dynamics of a four-photon Jaynes-Cummings model for large photon number. It is shown that at certain times the cavity field is in a pure state which is a superposition of two Kerr states, analogous to the Schrödinger cat state (superposition of two coherent states) which occurs in the one and two photon cases.