Direct Identification of Dilute Surface Spins on Al2 O3: Origin of Flux Noise in Quantum Circuits
Artikel i vetenskaplig tidskrift, 2017
An on-chip electron spin resonance technique is applied to reveal the nature and origin of surface spins on Al2O3. We measure a spin density of 2.2×1017 spins/m2, attributed to physisorbed atomic hydrogen and S=1/2 electron spin states on the surface. This is direct evidence for the nature of spins responsible for flux noise in quantum circuits, which has been an issue of interest for several decades. Our findings open up a new approach to the identification and controlled reduction of paramagnetic sources of noise and decoherence in superconducting quantum devices.
Författare
Sebastian Erik de Graaf
National Physical Laboratory (NPL)
Astghik Adamyan
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Tobias Lindström
National Physical Laboratory (NPL)
D. Erts
Latvijas Universitate
Sergey Kubatkin
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
A.Y. Tzalenchuk
Royal Holloway University of London
National Physical Laboratory (NPL)
Andrey Danilov
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Physical Review Letters
0031-9007 (ISSN) 1079-7114 (eISSN)
Vol. 118 5 057703- 057703Styrkeområden
Nanovetenskap och nanoteknik
Materialvetenskap
Ämneskategorier
Den kondenserade materiens fysik
DOI
10.1103/PhysRevLett.118.057703