Loss and decoherence in superconducting circuits on silicon: Insights
from electron spin resonance
- URL: http://arxiv.org/abs/2402.03889v1
- Date: Tue, 6 Feb 2024 10:53:59 GMT
- Title: Loss and decoherence in superconducting circuits on silicon: Insights
from electron spin resonance
- Authors: Aditya Jayaraman, Andrey V. Danilov, Jonas Bylander and Sergey E.
Kubatkin
- Abstract summary: Solid-state devices used for quantum computation and quantum sensing applications are adversely affected by loss and noise caused by spurious, charged two-level systems (TLS) and stray paramagnetic spins.
We use an on-chip electron spin resonance technique, with niobium nitride (NbN) superconducting resonators, to study surface spins on silicon and the effect of post-fabrication surface treatments.
We observe a 3-to-5-fold reduction in the total density of spins after surface treatments, and demonstrate the efficacy of ESR spectroscopy in developing strategies to mitigate loss and decoherence in quantum systems.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Solid-state devices used for quantum computation and quantum sensing
applications are adversely affected by loss and noise caused by spurious,
charged two-level systems (TLS) and stray paramagnetic spins. These two sources
of noise are interconnected, exacerbating the impact on circuit performance. We
use an on-chip electron spin resonance (ESR) technique, with niobium nitride
(NbN) superconducting resonators, to study surface spins on silicon and the
effect of post-fabrication surface treatments. We identify two distinct spin
species that are characterized by different spin-relaxation times and respond
selectively to various surface treatments (annealing and hydrofluoric acid).
Only one of the two spin species has a significant impact on the TLS-limited
resonator quality factor at low-power (near single-photon) excitation. We
observe a 3-to-5-fold reduction in the total density of spins after surface
treatments, and demonstrate the efficacy of ESR spectroscopy in developing
strategies to mitigate loss and decoherence in quantum systems.
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