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Simultaneous Brillouin and piezoelectric coupling to a high-frequency bulk acoustic resonator

Journal Article · · Optica

Bulk acoustic resonators support robust, long-lived mechanical modes, capable of coupling to various quantum systems. In separate works, such devices have achieved strong coupling to both superconducting qubits, via piezoelectricity, and optical cavities, via Brillouin interactions. In this work, we present a hybrid microwave–optical platform capable of coupling to bulk acoustic waves through cavity-enhanced piezoelectric and photoelastic interactions. The modular, tunable system achieves fully resonant and well-mode-matched interactions among a 3D microwave cavity, a high-frequency bulk acoustic resonator, and a Fabry–Perot cavity. We realize this piezo–Brillouin interaction in x-cut quartz, demonstrating the potential for strong optomechanical interactions and high cooperativity using optical cavity enhancement. We further show how this device functions as a bidirectional electro–opto–mechanical transducer, with transduction efficiency exceeding 10 − <#comment/> 8 , and a feasible path towards unity conversion efficiency. The high optical sensitivity and ability to apply a large resonant microwave field in this system also offers a tool for probing anomalous electromechanical couplings, which we demonstrate by investigating (nominally centrosymmetric) C a F 2 and revealing a parasitic piezoelectricity of 83 am/V. Such studies are an important topic for emerging quantum technologies, and highlight the versatility of this hybrid platform.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0012704; SC0019406
OSTI ID:
1909728
Alternate ID(s):
OSTI ID: 1923185
Journal Information:
Optica, Journal Name: Optica Journal Issue: 1 Vol. 10; ISSN 2334-2536
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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