Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.55: Poster
Montag, 18. März 2024, 15:00–18:00, Poster C
Broadband electron spin resonance spectroscopy of Er ions in CaWO4 with planar waveguides — •Georg Mair1,2, Ana Strinic1,2,3, Chiun Fu1,2, Jianpeng Chen1,2, Hans Huebl1,2,3, Kirill G. Fedorov1,2,3, Rudolf Gross1,2,3, and Nadezhda Kukharchyk1,2,3 — 1Walther-Meissner-Institute, Bavarian Academy of Sciences, Garching — 2Technical University of Munich, School of Natural Sciences, Physics Department, Garching — 3Munich Center for Quantum Science and Technology, Munich
Hybrid systems comprising qubits and quantum memory units have been proposed to improve processor architecture in applications of quantum computing with superconducting circuits [1]. Suitable quantum memory candidates in the microwave regime are rare-earth ions in crystal host lattices, such as Er:CaWO4. Broadband ESR spectroscopy at 12 mK reveals desired ZEFOZ (Zero First-Order Zeeman) transitions at low magnetic fields, where the longest coherence times of the hyperfine spin states are expected due to their minimized sensitivity to fluctuations of external fields [2]. We present advances in the fabrication of superconducting transmission lines utilizing a planar waveguide geometry to enhance coupling of propagating microwaves to spin systems.
[1] É. Gouzien, N. Sangouard, Phys. Rev. Lett. 127, 140503 (2021)
[2] A. Ortu et al. Nat. Mater 17, 671 (2018)
Keywords: quantum memory; rare-earth ions; electron spin resonance; crystalline membrane; planar waveguides