C++QED: An object-oriented framework for wave-function simulations of cavity QED systems

We present a framework for efficiently performing Monte Carlo wave-function simulations in cavity QED with moving particles. It relies heavily on the object-oriented programming paradigm as realised in C++, and is extensible and applicable for simulating open interacting quantum dynamics in general. The user is provided with a number of ``elements'', eg pumped moving particles, pumped lossy cavity modes, and various interactions to compose complex interacting systems, which contain several particles moving in electromagnetic fields of various configurations, and perform wave-function simulations on such systems. A number of tools are provided to facilitate the implementation of new elements.Comment: 31 pages, 8 figures, 3 table

Scaffolding asynchronous communication

This research identifies and studies the techniques and strategies used by New Zealand tertiary tutors in the process of encouraging participation, and ultimately learning, when using online asynchronous discussion forums. The last decade has seen considerable growth in online learning and the discussion forum now features as a mainstream teaching tool in both fully online courses and in blended delivery. Of interest are the strategies tutors use in online discussion forums: exactly how do tutors encourage an online class to participate and engage in meaningful discourse in a textual asynchronous communication medium? Twelve New Zealand tertiary tutors were interviewed in a semi-structured manner, gathering both demographic data and data from open-ended questions. The openended questions were designed to ascertain the tutors’ perceptions about the pedagogical considerations of online learning, the barriers students may face and the techniques the tutors use to compensate for these barriers. The results were analysed using qualitative methods, summarised and discussed. The study shows that a number of the tutors interviewed used a range of strategies across both the affective and cognitive domains, and these tutors were aware of which barriers their strategies are targeting. Where a narrow selection of strategies was used it was apparent that some of the barriers to participation were not being addressed

Digital response with femtosecond resolution in an optical AND gate

We present a numerical simulation of an all-optical AND logic gate utilising soliton formation in a planar waveguide with a parametric nonlinearity. We investigate switching performance as a function of input logic simultaneity and internal geometry. A highly digital response in the transmitted pulse energy is observed, with femtosecond time discrimination. (C) 2000 Elsevier Science B.V. All rights reserved