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

Astghik Adamyan

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Tobias Lindström

National Physical Laboratory

D. Erts

University of Latvia

Sergey Kubatkin

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

A.Y. Tzalenchuk

Royal Holloway University of London

National Physical Laboratory

Andrey Danilov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 118 057703- 057703

Styrkeområden

Nanovetenskap och nanoteknik

Materialvetenskap

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1103/PhysRevLett.118.057703