Interacting two-level defects as sources of fluctuating high-frequency noise in superconducting circuits

Muller, Clemens, Lisenfeld, Jurgen, Shnirman, Alexander and Poletto, Stefano (2015) Interacting two-level defects as sources of fluctuating high-frequency noise in superconducting circuits. Physical Review B - Condensed Matter and Materials Physics, 92 3: 035442-1-035442-13. doi:10.1103/PhysRevB.92.035442

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Author Muller, Clemens
Lisenfeld, Jurgen
Shnirman, Alexander
Poletto, Stefano
Title Interacting two-level defects as sources of fluctuating high-frequency noise in superconducting circuits
Journal name Physical Review B - Condensed Matter and Materials Physics   Check publisher's open access policy
ISSN 1550-235X
1098-0121
Publication date 2015-07-15
Year available 2015
Sub-type Article (original research)
DOI 10.1103/PhysRevB.92.035442
Open Access Status File (Publisher version)
Volume 92
Issue 3
Start page 035442-1
End page 035442-13
Total pages 13
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract Since the very first experiments, superconducting circuits have suffered from strong coupling to environmental noise, destroying quantum coherence and degrading performance. In state-of-the-art experiments, it is found that the relaxation time of superconducting qubits fluctuates as a function of time. We present measurements of such fluctuations in a 3D-transmon circuit and develop a qualitative model based on interactions within a bath of background two-level systems (TLS) which emerge from defects in the device material. In our model, the time-dependent noise density acting on the qubit emerges from its near-resonant coupling to high-frequency TLS which experience energy fluctuations due to their interaction with thermally fluctuating TLS at low frequencies. We support the model by providing experimental evidence of such energy fluctuations observed in a single TLS in a phase qubit circuit.
Keyword Fluctuating high-frequency noise
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID W911NF-10-1-0324
LI 2446/1-1
1183-229.14/2011
14-42-00044
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
 
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