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Updated: Jun 26, 2026

Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
Published on: October 30, 2012
Vibronic spectroscopy of an artificial molecule
David Gunnarsson1, Jani Tuorila, Antti Paila
1Low Temperature Laboratory, Helsinki University of Technology, FI-02015 HUT, Finland.
We observed artificial molecule behavior in a qubit-oscillator system, revealing vibronic sideband transitions. This phenomenon is governed by the Franck-Condon principle and oscillator cooling or heating effects.
Area of Science:
- Quantum computing
- Quantum optics
- Solid-state physics
Background:
- Charge-phase qubits are fundamental building blocks in quantum computing.
- LC oscillators are crucial components in quantum circuits.
- Understanding qubit-oscillator interactions is key to advancing quantum technologies.
Purpose of the Study:
- To investigate the interaction between a charge-phase qubit and an LC oscillator.
- To characterize the emergent "artificial molecule" behavior and its associated transitions.
- To explore the influence of quantum principles on the observed phenomena.
Main Methods:
- Microwave reflection experiments were conducted.
- A charge-phase qubit was coupled to an LC oscillator.
- The reflected microwave signal was analyzed to identify spectral features.
Main Results:
- The qubit-oscillator system exhibited characteristics of an artificial molecule.
- Vibronic sideband transitions were observed, indicating coupled quantum states.
- The reflected signal was found to be dependent on the Franck-Condon principle.
- Resolved-sideband cooling or heating of the oscillator influenced the signal.
Conclusions:
- The study demonstrates a novel quantum system mimicking molecular behavior.
- The findings highlight the interplay between quantum mechanics and circuit elements.
- This research provides insights into controlling and understanding quantum interactions in superconducting circuits.
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