Sensitive spin detection using an on-chip SQUID-waveguide resonator

G. Yue; L. Chen; J. Barreda; V. Bevara; L. Hu; L. Wu; Z. Wang; P. Andrei; S. Bertaina; I. Chiorescu

doi:10.1063/1.5006693

Sensitive spin detection using an on-chip SQUID-waveguide resonator

G. Yue, L. Chen, J. Barreda, V. Bevara, L. Hu, L. Wu, Z. Wang, P. Andrei, S. Bertaina, I. Chiorescu

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Precise detection of spin resonance is of paramount importance to achieve coherent spin control in quantum computing. We present a setup for spin resonance measurements, which uses a dc-SQUID flux detector coupled to an antenna from a coplanar waveguide. The SQUID and the waveguide are fabricated from a 20 nm Nb thin film, allowing high magnetic field operation with the field applied parallel to the chip. We observe a resonance signal between the first and third excited states of Gd spins S = 7/2 in a CaWO₄ crystal, relevant for state control in multi-level systems.

Original language	English
Article number	202601
Journal	Applied Physics Letters
Volume	111
Issue number	20
DOIs	https://doi.org/10.1063/1.5006693
State	Published - Nov 13 2017
Externally published	Yes

Funding

This work was supported by the NSF Grant Nos. DMR-1206267 and CNRS-PICS CoDyLow. The NHMFL was supported by the Cooperative Agreement Grant No. DMR-1157490 and the State of Florida. We acknowledge support from the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB04000000). We are thankful to Dr. A. Tkachuk for providing the Gd sample and to X. Lian, S. Zhang and Dr. Xiong for the support in device fabrication.

Funders	Funder number
National Science Foundation
Directorate for Mathematical and Physical Sciences	1157490, 1206267
Directorate for Mathematical and Physical Sciences
Chinese Academy of Sciences

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AU - Yue, G.

AU - Chen, L.

AU - Barreda, J.

AU - Bevara, V.

AU - Hu, L.

AU - Wu, L.

AU - Wang, Z.

AU - Andrei, P.

AU - Bertaina, S.

AU - Chiorescu, I.

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AB - Precise detection of spin resonance is of paramount importance to achieve coherent spin control in quantum computing. We present a setup for spin resonance measurements, which uses a dc-SQUID flux detector coupled to an antenna from a coplanar waveguide. The SQUID and the waveguide are fabricated from a 20 nm Nb thin film, allowing high magnetic field operation with the field applied parallel to the chip. We observe a resonance signal between the first and third excited states of Gd spins S = 7/2 in a CaWO4 crystal, relevant for state control in multi-level systems.

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Sensitive spin detection using an on-chip SQUID-waveguide resonator

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