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arXiv:1102.0131 · Physical Review Letters

Bright Side of the Coulomb Blockade

M. Hofheinz, F. Portier, Quentin Baudouin, P. Joyez, D. Vion, Patrice Bertet, P. Roche, D. Esteve

Published May 27, 2011• 156 citations
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Abstract

We explore the photonic (bright) side of the 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 with 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.

DOI
10.1103/physrevlett.106.217005

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