Emission of Nonclassical Radiation by Inelastic Cooper Pair Tunneling

M. Westig; B. Kubala; O. Parlavecchio; Y. Mukharsky; C. Altimiras; P. Joyez; D. Vion; P. Roche; D. Esteve; M. Hofheinz; M. Trif; P. Simon; J. Ankerhold; F. Portier

doi:10.1103/PhysRevLett.119.137001

Emission of Nonclassical Radiation by Inelastic Cooper Pair Tunneling

M. Westig, B. Kubala, O. Parlavecchio, Y. Mukharsky, C. Altimiras, P. Joyez, D. Vion, P. Roche, D. Esteve, M. Hofheinz, M. Trif, P. Simon, J. Ankerhold, F. Portier

DOI 10.1103/PhysRevLett.119.137001 · Physical Review Letters

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Abstract

We show that a properly dc-biased Josephson junction in series with two microwave resonators of different frequencies emits photon pairs in the resonators. By measuring auto- and intercorrelations of the power leaking out of the resonators, we demonstrate two-mode amplitude squeezing below the classical limit. This nonclassical microwave light emission is found to be in quantitative agreement with our theoretical predictions, up to an emission rate of 2 billion photon pairs per second.

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