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High-Cooperativity Coupling of a Rare-Earth Spin Ensemble to a Superconducting Resonator Using Yttrium Orthosilicate as a Substrate

Dold, G; Zollitsch, CW; O'Sullivan, J; Welinski, S; Ferrier, A; Goldner, P; de Graaf, SE; ... Morton, JJL; + view all (2019) High-Cooperativity Coupling of a Rare-Earth Spin Ensemble to a Superconducting Resonator Using Yttrium Orthosilicate as a Substrate. Physical Review Applied , 11 (5) , Article 054082. 10.1103/PhysRevApplied.11.054082. Green open access

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Abstract

Yttrium orthosilicate ( Y 2 Si O 5 , or YSO) has proved to be a convenient host for rare-earth ions used in demonstrations of microwave quantum memories and optical memories with microwave interfaces and shows promise for coherent microwave-optical conversion owing to its favorable optical and spin properties. The strong coupling required by such microwave applications could be achieved using superconducting resonators patterned directly on Y 2 Si O 5 and hence we investigate here the use of Y 2 Si O 5 as an alternative to sapphire or silicon substrates for superconducting-hybrid-device fabrication. A Nb N resonator with frequency 6.008 GHz and low-power quality factor Q ≈ 400 000 is fabricated on a Y 2 Si O 5 substrate doped with isotopically enriched 145 Nd . Measurements of dielectric loss yield a loss tangent tan  δ = 4 × 10 − 6 , comparable to that of sapphire. Electron spin resonance (ESR) measurements performed using the resonator show the characteristic angular dependence expected from the anisotropic 145 Nd spin and the coupling strength between the resonator and the electron spins is in the high-cooperativity regime ( C = 30 ). These results demonstrate that Y 2 Si O 5 is an excellent substrate for low-loss, high- Q microwave resonators, especially in applications for coupling to optically accessible rare-earth spins.

Type: Article
Title: High-Cooperativity Coupling of a Rare-Earth Spin Ensemble to a Superconducting Resonator Using Yttrium Orthosilicate as a Substrate
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevApplied.11.054082
Publisher version: https://doi.org/10.1103/PhysRevApplied.11.054082
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Physics, Applied, Physics, QUANTUM MEMORY
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10076480
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