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Title: Anomalous charge noise in superconducting qubits

Journal Article · · Physical Review B
 [1];  [1];  [1];  [2];  [1];  [1];  [3];  [4];  [5];  [5];  [2];  [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Syracuse Univ., NY (United States)
  3. Univ. of Wisconsin, Madison, WI (United States); Centre National de la Recherche Scientifique (CNRS) and Sorbonne Univ., Paris (France). Inst. of Physics (INP) and Lab. of Theoretical Physics and High Energy (LPTHE)
  4. Univ. of Wisconsin, Madison, WI (United States); Centre National de la Recherche Scientifique (CNRS) and Sorbonne Univ., Paris (France). Inst. of Physics (INP) and Lab. of Theoretical Physics and High Energy (LPTHE)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
+ Show Author Affiliations

In this work, we have used Ramsey tomography to characterize charge noise in a weakly charge-sensitive superconducting qubit. We find a charge noise that scales with frequency as1/fα over five decades with α = 1.93 and a magnitude Sq(1Hz) = 2.9 × 10–4e2/Hz . The noise exponent and magnitude of the low-frequency noise are much larger than those seen in prior work on single electron transistors, yet are consistent with reports of frequency noise in other superconducting qubits. Furthermore, we confirm frequent large-amplitude jumps in offset charge exceeding 0.1e; these large discrete charge jumps are incompatible with a picture of localized dipolelike two-level fluctuators. The data reveal an unexpected dependence of charge noise on device scale and suggest models involving either charge drift or fluctuating patch potentials.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of the Director of National Intelligence; National Science Foundation (NSF); US Army Research Office (ARO)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1579616
Report Number(s):
LLNL-JRNL--776205; 968046
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 14 Vol. 100; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Spectrum and coherence properties of the current-mirror qubit journal December 2019
Spectrum and Coherence Properties of the Current-Mirror Qubit text January 2019

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