Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session B26: Superconducting Circuits: Remote Entanglement and Waveguide QED
11:15 AM–2:15 PM,
Monday, March 4, 2019
BCEC
Room: 160B
Sponsoring
Unit:
DQI
Chair: Mollie Schwartz, MIT Lincoln Laboratory
Abstract: B26.00001 : Particle production in ultrastrong-coupling waveguide QED*
11:15 AM–11:27 AM
Presenter:
Nicolas Gheeraert
(Néel Institute, CNRS and Université Grenoble-Alpes)
Authors:
Nicolas Gheeraert
(Néel Institute, CNRS and Université Grenoble-Alpes)
Xin Zhang
(Department of Physics, Duke University)
Théo Sépulcre
(Néel Institute, CNRS and Université Grenoble-Alpes)
Soumya Bera
(Department of Physics, Indian Institute of Technology Bombay)
Nicolas Roch
(Néel Institute, CNRS and Université Grenoble-Alpes)
Harold U Baranger
(Department of Physics, Duke University)
Serge Florens
(Néel Institute, CNRS and Université Grenoble-Alpes)
First, I will show how one can tackle the time-evolution of such a non-trivial system using a novel numerical technique based on an expansion of the full state vector in terms of multi-mode coherent states. Inspired by earlier semi-classical approaches, this numerically exact method provides an important advance compared to the state-of-the-art techniques that have been used so far to study the many-mode ultra-strong coupling regime.
I will then move on to present the central prediction of my work concerning the scattering of low-power coherent signals on a qubit. Most remarkably, I will show that the qubit non-linearity, transferred to the waveguide through the ultra-strong light-matter interaction, is able to split photons from the incoming beam into several lower-energy photons. This splitting leads to the emergence of a low-frequency continuum in the scattered power spectrum that dominates the inelastic signal.
*The Nanoscience Foundation
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