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QUANTUM INFORMATION. Coherent coupling between a ferromagnetic magnon and a superconducting qubit
Yutaka Tabuchi1, Seiichiro Ishino2, Atsushi Noguchi2
1Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan. tabuchi@qc.rcast.u-tokyo.ac.jp.
Science (New York, N.Y.)
|July 11, 2015
Summary
Researchers achieved strong coupling between single magnons and superconducting qubits. This quantum control method, using microwave cavities, enhances magnon excitations for quantum information processing.
Area of Science:
- Condensed matter physics
- Quantum information science
Background:
- Ordered phases exhibit collective excitation modes called magnons.
- Magnons can extend to macroscopic dimensions, offering potential for quantum applications.
Purpose of the Study:
- To demonstrate coherent coupling between single magnons and superconducting qubits.
- To achieve strong coupling regime for enhanced quantum control.
Main Methods:
- Utilizing a millimeter-sized ferromagnetic sphere for magnon excitation.
- Employing a superconducting qubit and microwave cavity for interaction mediation.
- Implementing a parametric drive for tunable magnon-qubit coupling.
Main Results:
- Achieved coherent coupling between a single magnon and a superconducting qubit.
- Demonstrated coupling strength exceeding damping rates, entering the strong coupling regime.
- Realized a tunable coupling scheme via parametric drive.
Conclusions:
- The developed approach enables versatile quantum control and measurement of magnons.
- This work advances hybrid quantum systems for potential quantum information processing applications.
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