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Hybrid circuit cavity quantum electrodynamics with a micromechanical resonator
J-M Pirkkalainen1, S U Cho, Jian Li
1Low Temperature Laboratory, Aalto University, PO Box 15100, FI-00076 Aalto, Finland. juha.pirkkalainen@aalto.fi
Nature
|February 15, 2013
Summary
Researchers integrated superconducting qubits with micromechanical resonators, creating a hybrid system. This system enables coherent quantum information transfer between qubits and phonons, paving the way for quantum interfaces.
Area of Science:
- Quantum physics
- Solid-state physics
- Quantum information science
Background:
- Hybrid quantum systems, combining distinct degrees of freedom like cavity quantum electrodynamics and trapped ions, are crucial for fundamental physics and quantum information control.
- Combining long-lived atomic states with superconducting circuits offers a promising avenue for quantum technologies.
Purpose of the Study:
- To integrate circuit cavity quantum electrodynamics with phonons by coupling a superconducting transmon qubit to a micromechanical resonator.
- To investigate the resulting hybrid electromechanical system as a model for quantum interfaces and fundamental studies of strong coupling.
Main Methods:
- Coupling a superconducting transmon qubit to both a microwave cavity and a phonon mode in a micromechanical resonator.
- Measuring the phonon Stark shift and qubit spectral line splitting into motional sidebands.
- Observing coherent quantum state conversion in the time domain via sideband Rabi oscillations.
Main Results:
- Demonstrated a superconducting qubit interacting with both microwave photons and mechanical phonons, acting as an atom coupled to two distinct cavities.
- Observed and measured the phonon Stark shift and motional sidebands, indicating transitions between dressed electromechanical states.
- Achieved coherent conversion of qubit excitation into phonons, evidenced by sideband Rabi oscillations.
Conclusions:
- The developed hybrid system serves as a model for exploring strong coupling regimes and potential quantum interfaces.
- This system may enable quantum information storage in long-lived phonon states and facilitate coupling to optical photons.
- The findings contribute to the fundamental understanding of hybrid quantum systems and their applications in quantum technologies.
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