Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Superconducting Electronics and Cryogenics: Poster Session
TT 31.5: Poster
Donnerstag, 8. September 2022, 15:00–18:00, P1
Reflection-type superconducting microwave resonators for spin-based quantum memories — •Julian Franz1,2, Patricia Oehrl1,2, Manuel Müller1,2, Thomas Luschmann1,2,3, Rudolf Gross1,2,3, and Hans Huebl1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Munich Center for Quantum Science and Technologies (MCQST), Munich, Germany
Solid-state spin ensembles are considered as excellent candidates for quantum memory applications due to their long coherence times and frequency compatibility with superconducting quantum circuits. The realization of such quantum memory requires the conversion of quantum microwave signals to excitations in the spin ensemble, their storage, and retrieval. This requires the detailed understanding and design optimization of the employed microwave circuit. The excitation transfer is typically measured by using a hanger type resonator. However, in a reflection-type geometry, all of the signal power is available for measurement, which gives nominally a factor of 2 improvement of the signal-to-noise ratio relative to the hanger configuration [1]. Here, we discuss the design concepts for superconducting microwave circuits with emphasis on tuning the coupling rates to the microwave circuit environment and the spin ensemble. In addition, we present experimental data using thin film NbTiN and Nb reflection-type resonators and characterize their performance at mK temperatures.
[1] H. Wang et al., Quantum Sci. Technol., 6 (3), 035015 (2021)