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Demonstration of an Effective Ultrastrong Coupling between Two Oscillators
D Marković1, S Jezouin1, Q Ficheux1,2
1Département de physique de l'ENS, Laboratoire Pierre Aigrain, École normale supérieure, PSL Research University, Université Paris Diderot, Sorbonne Paris Cité, Sorbonne Universités, UPMC University Paris 06, CNRS, 75005 Paris, France.
Physical Review Letters
|August 11, 2018
Summary
Researchers simulated ultrastrong coupling between two quantum harmonic oscillators. They observed mode hybridization and demonstrated ground-state properties via simultaneous single- and two-mode squeezing below vacuum fluctuations.
Area of Science:
- Quantum optics
- Condensed matter physics
- Quantum information science
Background:
- Ultrastrong coupling between quantum systems significantly alters dynamics and ground states.
- Previous studies focused on qubit-oscillator systems; the two-oscillator case is less explored.
- Directly probing ground states in natural ultrastrong coupling implementations is experimentally challenging.
Purpose of the Study:
- To investigate the ultrastrong coupling regime for two harmonic oscillators.
- To experimentally simulate and probe the ground state properties of such a system.
- To explore analog quantum simulation as a method for studying exotic quantum phenomena.
Main Methods:
- Analog quantum simulation using a nonlinear superconducting circuit.
- Dual frequency pumping to control the effective coupling rate.
- Spectroscopic analysis to identify mode hybridization.
- Measurement of radiated field squeezing to characterize the ground state.
Main Results:
- Observed spectroscopic signatures indicative of mode hybridization, characteristic of ultrastrong coupling.
- Experimentally demonstrated simultaneous single- and two-mode squeezing of the radiated field.
- Showcased ground state properties of the simulated ultrastrong coupling regime.
- Validated analog quantum simulation for studying ultrastrongly coupled systems.
Conclusions:
- Ultrastrong coupling between two harmonic oscillators leads to observable mode hybridization.
- Analog quantum simulation provides a viable platform for studying elusive ground state properties.
- The observed squeezing phenomena confirm key theoretical predictions for this regime.
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