2011/02/01 by Max Hofheinz, Fabien Portier, Quentin Baudouin +5 · 1 citation
Physics and Astronomy · #cond-mat.supr-con #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevlett.106.217005
published as Phys. Rev. Lett. 106, 217005 (2011) · 4 pages, 4 figures + 3 pages, 1 figure supplementary material
arxiv created 2011/02/01 · arxiv updated 2017/04/06
We explore the photonic (bright) side of dynamical Coulomb blockade (DCB) by measuring the radiation emitted by a dc voltage-biased Josephson junction embedded in a microwave resonator. In this regime Cooper pair tunneling is inelastic and associated to the transfer of an energy 2eV into the resonator modes. We have measured simultaneously the Cooper pair current and the photon emission rate at the resonance frequency of the resonator. Our results show two regimes, in which each tunneling Cooper pair emits either one or two photons into the resonator. The spectral properties of the emitted radiation are accounted for by an extension to DCB theory.