• Editors' Suggestion

Spectrum of the Nuclear Environment for GaAs Spin Qubits

Filip K. Malinowski, Frederico Martins, Łukasz Cywiński, Mark S. Rudner, Peter D. Nissen, Saeed Fallahi, Geoffrey C. Gardner, Michael J. Manfra, Charles M. Marcus, and Ferdinand Kuemmeth
Phys. Rev. Lett. 118, 177702 – Published 28 April 2017
PDFHTMLExport Citation

Abstract

Using a singlet-triplet spin qubit as a sensitive spectrometer of the GaAs nuclear spin bath, we demonstrate that the spectrum of Overhauser noise agrees with a classical spin diffusion model over 6 orders of magnitude in frequency, from 1 mHz to 1 kHz, is flat below 10 mHz, and falls as 1/f2 for frequency f1Hz. Increasing the applied magnetic field from 0.1 to 0.75 T suppresses electron-mediated spin diffusion, which decreases the spectral content in the 1/f2 region and lowers the saturation frequency, each by an order of magnitude, consistent with a numerical model. Spectral content at megahertz frequencies is accessed using dynamical decoupling, which shows a crossover from the few-pulse regime (16π pulses), where transverse Overhauser fluctuations dominate dephasing, to the many-pulse regime (32π pulses), where longitudinal Overhauser fluctuations with a 1/f spectrum dominate.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 6 January 2017

DOI:https://doi.org/10.1103/PhysRevLett.118.177702

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology

Authors & Affiliations

Filip K. Malinowski1, Frederico Martins1, Łukasz Cywiński2, Mark S. Rudner1,3, Peter D. Nissen1, Saeed Fallahi4, Geoffrey C. Gardner4,5, Michael J. Manfra6,7, Charles M. Marcus8, and Ferdinand Kuemmeth1

  • 1Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
  • 2Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
  • 3Niels Bohr International Academy, Niels Bohr Institute, 2100 Copenhagen, Denmark
  • 4Department of Physics and Astronomy, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
  • 5School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA
  • 6Department of Physics and Astronomy, Birck Nanotechnology Center, and Station Q Purdue, Purdue University, West Lafayette, Indiana 47907, USA
  • 7School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
  • 8Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 118, Iss. 17 — 28 April 2017

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×