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Title: Anomalous charge noise in superconducting qubits

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of the Director of National Intelligence; National Science Foundation (NSF); US Army Research Office (ARO)
OSTI Identifier:
1579616
Report Number(s):
LLNL-JRNL-776205
Journal ID: ISSN 2469-9950; PRBMDO; 968046
Grant/Contract Number:  
AC52-07NA27344; DMR-1720415; W911NF-16-1-0114; NNCI-1542081
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 14; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Christensen, B. G., Wilen, C. D., Opremcak, A., Nelson, J., Schlenker, F., Zimonick, C. H., Faoro, L., Ioffe, L. B., Rosen, Y. J., DuBois, J. L., Plourde, B. L. T., and McDermott, R. Anomalous charge noise in superconducting qubits. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.140503.
Christensen, B. G., Wilen, C. D., Opremcak, A., Nelson, J., Schlenker, F., Zimonick, C. H., Faoro, L., Ioffe, L. B., Rosen, Y. J., DuBois, J. L., Plourde, B. L. T., & McDermott, R. Anomalous charge noise in superconducting qubits. United States. doi:https://doi.org/10.1103/PhysRevB.100.140503
Christensen, B. G., Wilen, C. D., Opremcak, A., Nelson, J., Schlenker, F., Zimonick, C. H., Faoro, L., Ioffe, L. B., Rosen, Y. J., DuBois, J. L., Plourde, B. L. T., and McDermott, R. Thu . "Anomalous charge noise in superconducting qubits". United States. doi:https://doi.org/10.1103/PhysRevB.100.140503. https://www.osti.gov/servlets/purl/1579616.
@article{osti_1579616,
title = {Anomalous charge noise in superconducting qubits},
author = {Christensen, B. G. and Wilen, C. D. and Opremcak, A. and Nelson, J. and Schlenker, F. and Zimonick, C. H. and Faoro, L. and Ioffe, L. B. and Rosen, Y. J. and DuBois, J. L. and Plourde, B. L. T. and McDermott, R.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.100.140503},
journal = {Physical Review B},
number = 14,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:
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Figures / Tables:

FIG. 1 FIG. 1: Micrograph of the charge-sensitive qubit (a; $E_C$/$h$ = 390 MHz, $E_J$/$h$ = 10.8 GHz) and the reference transmon (b; $E_C$/$h$ = 230 MHz, $E_J$/$h$ = 16 GHz). Here, the qubit structures are shown in blue; the readout resonator and feedline are red; and the charge and flux biasmore » lines are colored orange and purple, respectively. (c) Diagram of the qubit circuit.« less

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    Works referencing / citing this record:

    Spectrum and coherence properties of the current-mirror qubit
    journal, December 2019


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