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Laboratoire Pierre Aigrain

Accueil du site > La recherche au L.P.A. > Circuits et conducteurs quantiques > Physique mésoscopique > Circuits quantiques hybrides > Electrodynamique quantique en cavité avec des boites quantiques sur circuit > Towards hybrid electron-photon quantum devices

Towards hybrid electron-photon quantum devices

An atom coupled to a harmonic oscillator is one of the most illuminating paradigms for quantum measurements and amplification. Recently, the joint development of artificial two-level systems and high finesse microwave resonators in superconducting circuits has brought the realization of this model on a chip. This ‘‘circuit quantum electrodynamics’’ architecture allows us, at least in principle, to combine circuits with an arbitrary complexity. In this context, quantum dots can also be used as artificial atoms. Importantly, these systems often exhibit many-body features if coupled strongly to Fermi seas, as epitomized by the Kondo effect. Combining such quantum dots with microwave cavities would therefore enable the study of a new type of coupled fermionicphotonic system. Cavity quantum electrodynamics and its electronic counterpart circuit quantum electrodynamics address the interaction of light and matter in their most simple form, i.e., down to a single photon and a single atom (real or artificial). In the field of strongly correlated electronic systems, the Anderson model follows the same purified spirit . It describes a single electronic level with on site Coulomb repulsion coupled to a Fermi sea. In spite of its apparent simplicity, this model allows us to capture nontrivial many-body features of electronic transport in nanoscale circuits. It contains a wide spectrum of physical phenomena ranging from resonant tunneling and Coulomb blockade to the Kondo effect. Thanks to progress in nanofabrication techniques, the Anderson model has been emulated in quantum dots made out of twodimensional electron gas , C60 molecules or carbone nanotubes . In this work, we combine the two above situations. We couple a quantum dot in the Coulomb blockade or in the Kondo regime to a single mode of the electromagnetic field and take a step further towards circuit QED experiments with quantum dots.

« Coupling a quantum dot, fermionics leads and a microwave cavity on a chip » M.R. Delbecq, V. Schmitt, F.D. Parmentier, N. Roch, J.J. Viennot, G. Fève, B. Huard, C. Mora, A. Cottet and T. Kontos, Phys. Rev. Lett. 107 256804 (2011).