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Low- and high-frequency noise from coherent two-level systems.
Alexander Shnirman1, Gerd Schön, Ivar Martin
1Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany.
Physical Review Letters
|May 21, 2005
Summary
Scientists found a link between low and high-frequency noise in superconducting quantum systems. A single group of two-level systems (TLS) can cause both noise types, explaining experimental results.
Area of Science:
- Quantum Computing
- Condensed Matter Physics
Background:
- Superconducting quantum systems are susceptible to low- and high-frequency noise.
- Understanding noise sources is critical for improving qubit coherence and performance.
Purpose of the Study:
- To investigate if a single ensemble of microscopic modes can generate both low- and high-frequency noise.
- To establish a relationship between noise power spectra based on microscopic mode properties.
Main Methods:
- Theoretical modeling of noise generation from an ensemble of two-level systems (TLS).
- Analysis of the dependence of noise power on TLS parameter distributions (tunnel splitting and bias).
Main Results:
- A single ensemble of coherent two-level systems (TLS) can explain both low- and high-frequency noise.
- A specific distribution of TLS parameters (log-uniform in tunnel splitting, linear in bias) accurately models experimental observations.
Conclusions:
- The proposed model of TLS ensembles provides a unified explanation for observed noise characteristics in superconducting quantum systems.
- The findings offer insights into noise mitigation strategies for advanced quantum technologies.