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Title: Rapid characterization of microscopic two-level systems using Landau-Zener transitions in a superconducting qubit

We demonstrate a fast method to detect microscopic two-level systems in a superconducting phase qubit. By monitoring the population leak after sweeping the qubit bias flux, we are able to measure the two-level systems that are coupled with the qubit. Compared with the traditional method that detects two-level systems by energy spectroscopy, our method is faster and more sensitive. This method supplies a useful tool to investigate two-level systems in solid-state qubits.
Authors:
 [1] ;  [2] ; ;  [1] ;  [3] ;  [4]
  1. National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093 (China)
  2. (United States)
  3. (China)
  4. Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045 (United States)
Publication Date:
OSTI Identifier:
22482044
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPARATIVE EVALUATIONS; LEAKS; MONITORING; QUBITS; SOLIDS; SPECTROSCOPY