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Séminaire « Nanoélectronique Quantique »

Mardi 21 mai à 15h00,
salle Remy Lemaire, K223

Orateur : Ciprian Padurariu, Université de Delft, Pays-Bas
"Statistics of Radiation at Josephson parametric Resonance"


My talk focuses on the counting statistics of radiation emitted below the threshold of parametric resonance in a Josephson junction circuit. This theoretical work was motivated by a recent experiment [Hofheinz et al., Phys. Rev. Lett. 106, 217005 (2011)] that has measured the radiation emitted by a dc voltage-biased Josephson junction embedded in a microwave resonator. In contrast to most optical systems, a significant part of the radiation emitted can be collected and converted to an output signal. This provides the opportunity to measure the correlations of the radiation. We have quantified the correlations by deriving a closed expression for the full counting statistics in the limit of long measurement times. Our results suggest that the statistics can be interpreted in terms of uncorrelated bursts, each encompassing 2N photons ; this accounts for the bunching of the photon pairs produced in the course of the parametric resonance. In addition, we have studied the time correlations within the bursts and have calculated the frequency-resolved cross-correlations.

Ref. : C. Padurariu, F. Hassler, and Yuli V. Nazarov, Phys. Rev. B 86, 054514 (2012)

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