Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4905149
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Funding
- EU project SOLID
- Deutsche Forschungsgemeinschaft (DFG)
- State of Baden-Wurttemberg through the DFG Center for Functional Nanostructures (CFN)
- Heinrich Boll Stiftung
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We have investigated dielectric losses in amorphous silicon oxide (a-SiO) thin films under operating conditions of superconducting qubits (mK temperatures and low microwave powers). For this purpose, we have developed a broadband measurement setup employing multiplexed lumped element resonators using a broadband power combiner and a low-noise amplifier. The measured temperature and power dependences of the dielectric losses are in good agreement with those predicted for atomic two-level tunneling systems (TLS). By measuring the losses at different frequencies, we found that the TLS density of states is energy dependent. This had not been seen previously in loss measurements. These results contribute to a better understanding of decoherence effects in superconducting qubits and suggest a possibility to minimize TLS-related decoherence by reducing the qubit operation frequency. (C) 2015 AIP Publishing LLC.
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