Statut  Confirmé 
Série  LPENSMDQ 
Domaines  condmat 
Date  Lundi 7 Mars 2022 
Heure  13:30 
Institut  LPENS 
Salle  L378 
Nom de l'orateur  Ménard 
Prenom de l'orateur  Gerbold 
Addresse email de l'orateur  
Institution de l'orateur  Laboratoire de Physique et d'Etude des Matériaux, LPEM 
Titre  Emission of photon multiplets by a dcbiased superconducting circuit 
Résumé  In nature the emission of photon from electronic relaxation is a well known phenomenon. The rate at which this process happens is controlled by the fine structure constant alpha=1/137. Because of this small value, the emission of more than one photon from a single relaxation event is a very rare event in nature and in optical experiments. In order to increase the probability of emission of photon multiplets it is necessary to increase the lightmatter coupling intensity which can be done in the context of circuit QED by properly designing an RF resonator. I will discuss here the result obtained on a device with a coupling factor alpha = 2 [1]. By biasing a SQUID in series with a microwave resonator with a strong inductance coil we observe the emission of k photons for dc voltages Vdc=khf/2e which allows us to witness the emission of photon multiplets up to k=6. In order to investigate the statistic of the emission we compute the Fano factor from measurements of a second order correlator and find that for small enough Josephson energies the Fano factor coincides with k. We also perform a theoretical analysis of our system in order to understand the role of the bias noise as well as the detuning from the resonance condition and find a good agreement between theory and experiment. [1] C. Rolland et al. Phys. Rev. Lett. 122, 186804 (2019) 
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