CCQED

Circuit and Cavity Quantum Electrodynamics

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 Obiettivo del progetto (Objective)

'This network will bridge two very active disciplines in physics, namely the quantum electrodynamics of atoms or ions strongly interacting with light in resonators, and the emerging field of solid-state superconducting circuit quantum electrodynamics. Advanced techniques will be developed jointly with industry partners for the manipulation of a deterministic number of particles - atoms, ions or artificial atoms - with electromagnetic fields covering the microwave and the optical frequency spectrum. The interdisciplinary training of a new generation of young researchers will strengthen the European expertise in those fields, and will allow for a new discipline to emerge that combines single-atom control methods with superconductor micro-chip fabrication. The use of high-quality resonators, whether superconducting transmission lines or highly-reflecting mirrors, coupled to a controlled number of particles will open novel avenues to explore quantum dynamics via hitherto inaccessible physical mechanisms. These new control scenarii will be strengthened by the development of potentially marketable technologies of great multidisciplinary interest.

The network groups 10 research centres and 3 companies representing the cutting edge of research in the quantum electrodynamics of fundamental systems in Europe. The network will train 12 ESRs and 2 ERs, with focus on (i) establishing bonds between solid-state and quantum optics physics, (ii) strengthening the communication between theory and experiment, and, (iii) concretizing links between fundamental and applied research. Prominent scientists and industry leaders will contribute to the schools and workshops. Special attention will be given on developing complementary skills, such as communication, presentation, project planning and management.'

Descrizione progetto (Article)

The term cavity quantum electrodynamics (QED) was initially coined to describe the coupling of real atoms to microwave or optical photons stored in a resonator. Circuit quantum electrodynamics also includes the investigation of such phenomena in the solid state with artificial atoms coupled to on-chip superconducting resonators.

Both fields have made remarkable progress and demonstrated a diversity of effects. Experiments with resonators are described by simple theoretical models and can reveal fundamental aspects of the quantum world. Given that the different regimes of the same phenomena can be investigated with two different setups makes comparing results and sharing insight particularly valuable. The EU-funded project 'Circuit and cavity quantum electrodynamics' (CCQED) consists of premier scientists in both fields from academia and industry. They have joined forces and inducted 14 PhD and post-doctoral students into their network to investigate quantum electrodynamics.

All fellows are involved at the host institution in high-level research related to quantum electrodynamics to manipulate light and matter as well as develop novel methodologies. Several significant achievements in the first two years in these areas include quantum state tomography and mixed-state stabilisation of atom pairs. In addition to training at host institutions, the network provides schools, workshops and meetings to broaden perspectives and share insights on experimental methods and theoretical descriptions. During this reporting period, two schools were organised and attended by fellows as well as a large number of external scientists.

CCQED is training a new generation of young physicists in the theory and techniques at the convergence of two highly progressive fields. Partnership with industry is fostering technology transfer and the development of innovative new products. Quantum networks are an obvious and much sought-after application of cavity and circuit QED. The amazing window that has been opened, making it possible to see the laws governing the quantum universe, is a cause for celebration.