Towards a Quantum Electrodynamics of Conductors and non classical microwaves

The development of phase coherent electronics has partially consisted in probing to which extent the concepts of quantum optics could be adapted to electronic conductors. Here, we contribute to a unified description of electric transport in a phase coherent conductor and of the photonic degrees of freedom it is coupled to. We investigate both the properties of the photons emitted by a phase coherent conductor and the feedback of the coupling to the electromagnetic environment on quantum electronic transport itself.

• Bright Side of the Coulomb Blockade, M. Hofheinz, F. Portier, Q. Baudouin, P. Joyez, D. Vion, P. Bertet, P. Roche, and D. Esteve  Phys. Rev. Lett. 106, 217005 (2011), (arxiv)

• Experimental Determination of the Statistics of Photons Emitted by a Tunnel Junction, Eva Zakka-Bajjani, J. Dufouleur, N. Coulombel, P. Roche, D. C. Glattli, and F. Portier Phys. Rev. Lett. 104, 206802 (2010), (arxiv)

• Experimental Test of the High-Frequency Quantum Shot Noise Theory in a Quantum Point Contact, E. Zakka-Bajjani, J. Ségala, F. Portier, P. Roche, D. C. Glattli, A. Cavanna and Y. Jin  Phys. Rev. Lett. 99, 236803 (2007), (arxiv)

Spectral density of the radiation emitted by a Josephson junction in the DCB regime for one-left panel- and two photon processes-middle panel. The junction is embedded in a quarter wavelength resonator, which impedance is given by the right panel.