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Séminaire QUEST

Jeudi 15 juin à 9h30
Salle Rémy Lemaire, K223

Orateur : Pol Forn-Diaz (University of Waterloo)
"Waveguide QED in superconducting quantum circuits"

Abstract

Atoms and photons interact in free space in one of nature’s most fundamental processes. The dipolar interaction between the two systems is determined by fundamental constants, with one of its limiting factors being the mode volume of the propagating photons. A waveguide is an engineered medium that confines the electromagnetic field and in proximity to atoms allows light-matter interactions with stronger couplings. In superconducting quantum circuits it is possible to study quantum electrodynamics (QED) with a transmission line on a chip replacing the waveguide and a superconducting qubit playing the role of an artificial atom. By proper engineering of these circuits, a wide range of possibilities opens up : from atom-photon interactions in unexplored regimes to on-demand single-photon generation. In this talk, I am going to present recent experimental progress coupling qubits to open transmission lines. In the first part I will discuss a strongly driven qubit ultrastrongly coupled to a transmission line from the context of the spin boson model. In the second part I will show results from an on-demand single photon source engineered using a tunable boundary condition in a semi-infinite transmission line.

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