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TT: Fachverband Tiefe Temperaturen
TT 39: Superconducting Electronics
TT 39.4: Talk
Wednesday, March 29, 2023, 16:00–16:15, HSZ 304
Surface acoustic wave resonators on thin film piezoelectric substrates for quantum acoustics — •Thomas Luschmann1,2,3, Alexander Jung1,2, Stephan Geprägs1,2, Rudolf Gross1,2,3, and Hans Huebl1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Technische Universität München, TUM School of Natural Sciences, Physics Department, Garching, Germany — 3Munich Center for Quantum Science and Technology, Munich, Germany
Lithium Niobate (LNO) is a well established material for Surface Acoustic Wave (SAW) devices including resonators, delay lines and filters. Recently, multi-layer substrates based on LNO thin films have become commercially available. Here, we present a systematic study of the performance of SAW devices fabricated on LNO-on-Insulator (LNOI) and LNO-on-Silicon substrates and compare them to bulk LNO devices. Our study aims at applications of these substrates for quantum acoustics, i.e. the integration with superconducting circuits operating in the quantum regime. To this end, we design SAW resonators with a target frequency of 5 GHz and perform our experiments at millikelvin temperatures and microwave power levels corresponding to single photons or phonons. We investigate the device quality factors as a function of the excitation power and temperature and model the observed losses by the coupling of the resonator to a bath of two-level-systems (TLS). Our results suggest that SAW devices on thin film LNO on Silicon have sufficient performance to be used in future SAW based quantum acoustic devices.