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TT: Fachverband Tiefe Temperaturen
TT 54: Quantum Coherence and Quantum Information Systems II
TT 54.8: Talk
Thursday, March 30, 2023, 17:00–17:15, HSZ 304
Broadband electron spin resonance spectroscopy of rare earth spin ensembles at mK temperatures — •Ana Strinic1,2,3, Hans Huebl1,2,3, Rudolf Gross1,2,3, and Nadezhda Kukharchyk2,1,3 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, Garching, Germany — 2Walther-Meißner-Institut, Bavarian Academy of Sciences, Garching, Germany — 3Munich Center for Quantum Science and Technologies, Munich, Germany
Rare earth spin ensembles exhibit spin coherence times in the millisecond range and possess transitions at microwave frequencies [1,2]. These properties make them attractive candidates for realizing microwave quantum memories, which can be directly interfaced with superconducting quantum processors.
In principle, there are two options for the implementation of spin-based quantum memories: (i) coupling them to resonators, or (ii) interfacing them with an open transmission line. In particular, the latter is considered for multi-modal concepts or the storage of information based on atomic frequency comb protocols.
In this work we characterize the electron spin resonance Hamiltonian of an 167Er spin ensemble in a 7LiYF4 host crystal at mK temperatures using a broadband microwave spectroscopy approach. We find good agreement with published g and hyperfine tensors, which is key for the implementation of microwave quantum memory schemes at low magnetic fields.
[1] P.-Y. Li et al., Phys. Rev. Appl. 13, 024080 (2020)
[2] A. Ortu et al., Nat. Mater. 17, 671 (2018)