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RESEARCH PRODUCT
Direct Identification of Dilute Surface Spins on Al2O3 : Origin of Flux Noise in Quantum Circuits
Andrey DanilovS. E. De GraafDonats ErtsA. Ya. TzalenchukA. Ya. TzalenchukA. AdamyanSergey KubatkinTobias Lindströmsubject
PhysicsSuperconductivityQuantum decoherenceCondensed matter physicsSpinsPulsed EPRGeneral Physics and AstronomyMacroscopic quantum phenomena02 engineering and technology021001 nanoscience & nanotechnology01 natural scienceslaw.inventionlaw0103 physical sciencesCondensed Matter::Strongly Correlated Electrons010306 general physics0210 nano-technologyElectron paramagnetic resonanceQuantumNoise (radio)description
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-01-31 | Physical Review Letters |