Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms7182
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Funding
- Australian Research Council
- RMIT Foundation through an International Research Exchange Fellowship
- Deutsche Forschungsgemeinschaft DFG
- State of Baden-Wurttemberg through the DFG Center for Functional Nanostructures (CFN)
- EU project SOLID
- Karlsruhe Institute of Technology
- Ministry for Education and Science of Russian Federation [11.G34.31.0062]
- National University of Science and Technology MISIS [K2-2014-025]
- Deutsche Forschungsgemeinschaft
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Parasitic two-level tunnelling systems originating from structural material defects affect the functionality of various microfabricated devices by acting as a source of noise. In particular, superconducting quantum bits may be sensitive to even single defects when these reside in the tunnel barrier of the qubit's Josephson junctions, and this can be exploited to observe and manipulate the quantum states of individual tunnelling systems. Here, we detect and fully characterize a system of two strongly interacting defects using a novel technique for high-resolution spectroscopy. Mutual defect coupling has been conjectured to explain various anomalies of glasses, and was recently suggested as the origin of low-frequency noise in superconducting devices. Our study provides conclusive evidence of defect interactions with full access to the individual constituents, demonstrating the potential of superconducting qubits for studying material defects. All our observations are consistent with the assumption that defects are generated by atomic tunnelling.
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