Optimized Coplanar Waveguide Resonators for a Superconductor-Atom Interface

We describe the design and characterization of superconducting coplanar waveguide cavities tailored to facilitate strong coupling between superconducting quantum circuits and single trapped Rydberg atoms. For initial superconductor-atom experiments at 4.2 K, we show that resonator quality factors above $10^4$ can be readily achieved. Furthermore, we demonstrate that the incorporation of thick-film copper electrodes at a voltage antinode of the resonator provides a route to enhance the zero-point electric fields of the resonator in a trapping region that is 40 $\mu$m above the chip surface, thereby minimizing chip heating from scattered trap light. The combination of high resonator quality factor and strong electric dipole coupling between the resonator and the atom should make it possible to achieve the strong coupling limit of cavity quantum electrodynamics with this system.Comment: 4 pages, 4 figure

Public Services and the GATS

The status of public services is one of the most hotly debated issues surrounding the GATS. There are two approaches to distinguish such services from any other services: an institutional approach that focuses on the legal and institutional conditions governing supply (e.g. ownership status, market organisation), and a functional approach based on the policy objectives that may be involved (e.g. distributional and quality-related considerations, concepts of universal access). Given the wide range of institutional arrangements that exist in different jurisdictions, with significant variations over time, the former approach does not appear appropriate. The services provided by government-owned facilities, whose costs are covered directly by the State, may well be indistinguishable, for all practical purposes, from the services provided by private commercial operators, whose users (students, patients, passengers, etc.) are reimbursed. This paper discusses the relevance of the GATS for different organisational settings - from government monopolies to regulated and/or subsidized private provision - that may be used by WTO Members to meet typical public service objectives. It turns out that virtually all forms of organisation can be accommodated within the framework of the Agreement. To fully exploit its opportunities and avoid unpleasant surprises, however, governments would need to thoroughly analyse the relevant provisions in the light of their own policy objectives