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Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
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Optomechanical coupling between a multilayer graphene mechanical resonator and a superconducting microwave cavity
V Singh1, S J Bosman1, B H Schneider1
1Kavli Institute of NanoScience, Delft University of Technology, PO Box 5046, 2600 GA, Delft, The Netherlands.
Nature Nanotechnology
|August 25, 2014
Summary
Graphene mechanical resonators coupled with superconducting cavities achieve high sensitivity for quantum motion exploration. This study demonstrates strong optomechanical coupling, paving the way for quantum applications.
Area of Science:
- Physics
- Materials Science
- Quantum Mechanics
Background:
- Two-dimensional crystals like graphene offer low mass density, high frequency, and high quality factor (Q) for mechanical resonators.
- Microwave optomechanics using superconducting cavities provide high position sensitivity and enable quantum ground state preparation.
Purpose of the Study:
- To demonstrate and characterize the optomechanical coupling between a multilayer graphene resonator and a superconducting cavity.
- To explore the potential for quantum regime applications using graphene mechanical resonators.
Main Methods:
- Coupling a high-Q multilayer graphene resonator (Q up to 220,000) with a high-Q superconducting cavity.
- Utilizing thermomechanical noise for calibration to determine displacement sensitivity.
- Observing optomechanically induced reflection and absorption of microwave photons.
Main Results:
- Achieved a displacement sensitivity of 17 fm/√Hz.
- Demonstrated optomechanical coupling through photon reflection and absorption.
- Observed 17 dB mechanical microwave amplification and strong optomechanical backaction.
- Quantitatively extracted a cooperativity (C) of 8, indicating significant coupling strength.
Conclusions:
- The demonstrated strong optomechanical coupling in the graphene-superconducting cavity system is promising for exploring the quantum regime of mechanical motion.
- This system holds potential for advanced force/mass sensing applications.
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