Bonn 2025 – scientific programme
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QI: Fachverband Quanteninformation
QI 20: Quantum Networks (joint session QI/Q)
QI 20.2: Talk
Wednesday, March 12, 2025, 15:00–15:15, HS VIII
Designing a Microwave-to-Optical Transducer based on a High-Overtone Bulk Acoustic-Wave Resonator — •Tom Schatteburg1,2, Maxwell Drimmer1,2, Rodrigo Benevides1,2, Samuel Pautrel1,2, Hugo Doeleman1,2, Benjamin Neubauer1,2, Luca Ben Herrmann1,2, and Yiwen Chu1,2 — 1Department of Physics, ETH Zürich, Zurich, Switzerland — 2Quantum Center, ETH Zürich, Zürich, Switzerland
Microwave to optical transducers convert quantum states from platforms such as superconducting circuits into the thermal noise-free optical regime, promising a route towards a quantum network using telecom fibers as links. A widespread approach is to use a mechanical resonator as intermediate system that couples to both microwaves and optical photons. High-overtone bulk acoustic-wave resonators (HBARs) are a platform for which both electromechanical and optomechanical strong coupling as well as optomechanical ground state operation has been demonstrated. Here we present the design and intermediate results of building a microwave to optical transducer which uses an HBAR as intermediary. We demonstrate the insensitivity to laser light absorption of the acoustic mode as key advantage of the HBAR, and outline the path to combining microwave, acoustics and optics into one system. We discuss overcoming the challenges that arise when building the transducer, such as making high-frequency superconducting qubits, multimode dynamics, cryogenic alignment, and developing new materials.
Keywords: Superconducting qubits; Bulk acoustic wave resonators; Microwave-to-optical transduction; Photonic communication; Quantum computing