 |
 |
Article dans une revue
Demonstration of an Effective Ultrastrong Coupling between Two Oscillators
Abstract : When the coupling rate between two quantum systems becomes as large as their characteristic frequencies, it induces dramatic effects on their dynamics and even on the nature of their ground state. The case of a qubit coupled to a harmonic oscillator in this ultrastrong coupling regime has been investigated theoretically and experimentally. Here, we explore the case of two harmonic oscillators in the ultrastrong coupling regime. Probing the properties of their ground state remains out of reach in natural implementations. Therefore, we have realized an analog quantum simulation of this coupled system by dual frequency pumping a nonlinear superconducting circuit. The pump amplitudes directly tune the effective coupling rate. We observe spectroscopic signature of a mode hybridization that is characteristic of the ultrastrong coupling. We experimentally demonstrate a key property of the ground state of this simulated ultrastrong coupling between modes by observing simultaneous single- and two-mode squeezing of the radiated field below vacuum fluctuations.
https://hal-mines-paristech.archives-ouvertes.fr/hal-01944732
Contributeur : François Chaplais <>
Soumis le : mardi 4 décembre 2018 - 18:55:58
Dernière modification le : jeudi 24 septembre 2020 - 17:04:18
Contributeur : François Chaplais <>
Soumis le : mardi 4 décembre 2018 - 18:55:58
Dernière modification le : jeudi 24 septembre 2020 - 17:04:18
Lien texte intégral
