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Engineering multimode interactions in circuit quantum acoustodynamics
Uwe von Lüpke1,2, Ines C Rodrigues1,2, Yu Yang1,2
1Department of Physics, ETH Zürich, Zurich, Switzerland.
Nature Physics
|April 19, 2024
Summary
Scientists engineered tunable interactions between mechanical modes using a superconducting qubit. This quantum control enables phonon-based quantum simulations and the development of novel quantum memories.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Condensed Matter Physics
Background:
- Mechanical resonators offer practical advantages for quantum information processing due to their high-quality-factor modes and integration capabilities.
- Directly engineering interactions between mechanical modes for quantum gate emulation remains a significant challenge.
Purpose of the Study:
- To demonstrate an in situ tunable interaction between mechanical modes of a high-overtone bulk acoustic-wave resonator.
- To explore the use of this engineered interaction for quantum simulations and the Hong-Ou-Mandel effect with phonons.
Main Methods:
- Utilizing a parametrically driven superconducting transmon qubit to mediate interactions between phononic modes.
- Tailoring the qubit-mediated interaction to couple pairs or triplets of mechanical modes.
- Demonstrating the Hong-Ou-Mandel effect using the engineered phonon-phonon interaction.
Main Results:
- Successfully demonstrated an in situ tunable beamsplitter-type interaction between multiple mechanical modes.
- Showed that the interaction can be precisely controlled to couple selected pairs or triplets of phononic modes.
- Experimentally verified the Hong-Ou-Mandel effect for phonons, a key quantum optical phenomenon.
Conclusions:
- The engineered phonon-phonon interaction provides a powerful tool for quantum control in mechanical resonators.
- This work establishes phononic systems as a viable platform for quantum simulations and quantum memories.
- The demonstrated quantum control over mechanical modes opens new avenues for scalable quantum technologies.
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