Please note that this network is no longer active as it was foreseen for a limited period of 4 years (01/01/2011 – 31/12/2014). Last website update in February 2015.

Welcome to the network Circuit and Cavity Quantum Electro-Dynamics (CCQED, Contract No: 264666). 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 for a period of 4 years (01/01/2011 – 31/12/2014). 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. Positions have been funded 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.

A central research aim of CCQED is to exploit the controllability of the number of atoms, ions and artificial atoms strongly coupled to microwave as well as optical photons to perform experiments involving multi-particle and/or multi-photon states. Without exception, all theory partners in this network work closely with experiments and all of them have seen their predictions confirmed in experiments in the last decade. Theory partners come with strong expertise from both fields, superconducting solid-state and atomic physics, to develop in the four years a common theoretical understanding to support experiments and address new phenomena.  Many of the experimental partners in this network are world leaders in the field of quantum electrodynamics of fundamental systems. Network-wide and adapted training will be provided too, with the fruitful exchange of ideas between the two communities, and with a major contribution from 3 companies. A remarkable aspect for your career advancement is the access to the wide technological diversity of the experiments: manipulation of cold atoms, ion crystals, artificial atoms, cryogenics, superconductivity, vacuum physics, clean room, laser technology, hardware and software construction and electronics. Two companies plan to develop marketable products, with potential impacts of broad interest. Another notable scientific outcome is the possibility of building hybrid systems by exploiting the advantages of superconducting transmission lines to couple them to a real single atom. With this program, this network is expected to pioneer powerful new approaches for the study of quantum coherence and, by forming a new generation of young researchers both in academia and industries, it should fuel the growth of quantum technology in Europe.