Observation of directly interacting coherent two-level systems in an amorphous material

Download
Author
Lisenfeld, J; Grabovskij, GJ; Mueller, C; Cole, JH; Weiss, G; Ustinov, AVDate
2015-02-01Source Title
Nature CommunicationsPublisher
NATURE PUBLISHING GROUPUniversity of Melbourne Author/s
Cole, JaredAffiliation
School of PhysicsMetadata
Show full item recordDocument Type
Journal ArticleCitations
Lisenfeld, J., Grabovskij, G. J., Mueller, C., Cole, J. H., Weiss, G. & Ustinov, A. V. (2015). Observation of directly interacting coherent two-level systems in an amorphous material. NATURE COMMUNICATIONS, 6 (1), https://doi.org/10.1038/ncomms7182.Access Status
Open AccessAbstract
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.
Export Reference in RIS Format
Endnote
- Click on "Export Reference in RIS Format" and choose "open with... Endnote".
Refworks
- Click on "Export Reference in RIS Format". Login to Refworks, go to References => Import References