PRACQSYS 2018: Principles and Applications of Control in Quantum Systems

Collection PRACQSYS 2018: Principles and Applications of Control in Quantum Systems

Organizer(s) Brion, Etienne ; Diamanti, Eleni ; Ourjoumtsev, Alexei ; Rouchon, Pierre

Date(s) 02/07/2018 - 06/07/2018

linked URL https://sites.google.com/view/mcqs2018/pracqsys-2018

00:00:00 / 00:00:00

2 29

The vacuum-gap transmon qubit: ultra-strong light matter coupling and insights into the physics of the Lamb shift

In this talk, I will present our implementation of ultra-strong light-matter coupling using a compact vacuum-gap transmon qubit design. Using a qubit whose capacitance is dominated by the coupling to the cavity it hangs above, we observe a vacuum Rabi splitting of 1.2 GHz and achieve ratios of g/ = 0.19, well into the ultra-strong coupling regime to a multimode electromagnetic cavity. Motivated by a desire to analyze our data quantitatively, we developed circuit-quantization model for the multimode ultra-strong regime in which we find a “natural” renormalization of the parameters of the bare quantum Rabi model as modes are added. With this formulation, we gain new insight into the convergence of the Lamb shift, and also how “quantum” the Lamb shift is itself in circuit QED and beyond.

Information about the video

Date of recording 02/07/2018
Date of publication 06/07/2018
Institution IHP
Licence CC BY-NC-ND
Format MP4

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