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Walther-Meißner-Institut (WMI), Bayerische Akademie der Wissenschaften
Chair for Technical Physics (E23), Technische Universität München

WMI participates in FP7 project CCQED


March 21, 2011

Goldene Kreide

The Walther-Meißner-Institute participates in the network Circuit and Cavity Quantum Electro-Dynamics (CCQED). This network has been granted 3.5 Million Euros by the European Union through a Marie Curie Action within the Seventh Framework Program Initial Training Network ITN-People-2010 . The aim of CCQED is to bridge two communities in physics, in the academic and private sectors, to share, pursue and diffuse within Europe the benefits of collaborations in the science of elementary quanta. Jobs are available for 12 Early Stage Researchers (ESR) for a 3 years PhD-program, and for 2 Experienced Researchers (ER) for postdoctoral research during 2 years.

It is now possible to investigate the coupling between light and matter at its most fundamental level, where one or a few atoms strongly interact with a single mode of the electromagnetic field stored in a resonator containing a small number of photons. This research area, named cavity quantum electrodynamics, has been at first investigated with real atoms coupled to microwave or optical photons; but the recent years have brought the demonstration that the very same physics can be studied in a solid-state architecture, nicknamed circuit quantum electrodynamics, where now artificial atoms made of Josephson junctions are coupled to on-chip superconducting resonators. Both fields made spectacular progress in the past years, with a remarkable diversity of demonstrated physical effects. To list a few, milestones include the direct observation of the quantum jumps of microwave light, the deterministic generation and tomography of arbitrary quantum states of a resonator by superconducting quantum bits, the evidence of the lamb shift in a solid-state system, the generation of nonlinear photonics with one atom, and the realization of feedback schemes on single atoms triggered by the detection of single photons.

Modern circuit and cavity quantum electrodynamics illuminate the most fundamental aspects of coherence and decoherence in quantum physics, where experiments with resonators can be described by elementary theoretical models and, yet, reveal intriguing aspects of reversible and dissipative quantum dynamics. It is remarkable that circuit and cavity quantum electrodynamics share the same concepts, whereas they explore different regimes with essentially different techniques. Such complementarities give a strong motivation to bring together the solid-state circuit and the atomic physics cavity groups in Europe to form a unified scientific community.

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