Spectrum of the Nuclear Environment for GaAs Spin Qubits
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/f^{2} for...
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Published in | Physical review letters Vol. 118; no. 17; p. 177702 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
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United States
28.04.2017
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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/f^{2} for frequency f≳1 Hz. 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/f^{2} 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 (≳32 π pulses), where longitudinal Overhauser fluctuations with a 1/f spectrum dominate. |
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AbstractList | 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/f^{2} for frequency f≳1 Hz. 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/f^{2} 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 (≳32 π pulses), where longitudinal Overhauser fluctuations with a 1/f spectrum dominate. |
Author | Manfra, Michael J Kuemmeth, Ferdinand Nissen, Peter D Malinowski, Filip K Cywiński, Łukasz Marcus, Charles M Martins, Frederico Rudner, Mark S Fallahi, Saeed Gardner, Geoffrey C |
Author_xml | – sequence: 1 givenname: Filip K surname: Malinowski fullname: Malinowski, Filip K organization: Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark – sequence: 2 givenname: Frederico surname: Martins fullname: Martins, Frederico organization: Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark – sequence: 3 givenname: Łukasz surname: Cywiński fullname: Cywiński, Łukasz organization: Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland – sequence: 4 givenname: Mark S surname: Rudner fullname: Rudner, Mark S organization: Niels Bohr International Academy, Niels Bohr Institute, 2100 Copenhagen, Denmark – sequence: 5 givenname: Peter D surname: Nissen fullname: Nissen, Peter D organization: Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark – sequence: 6 givenname: Saeed surname: Fallahi fullname: Fallahi, Saeed organization: Department of Physics and Astronomy, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA – sequence: 7 givenname: Geoffrey C surname: Gardner fullname: Gardner, Geoffrey C organization: School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA – sequence: 8 givenname: Michael J surname: Manfra fullname: Manfra, Michael J organization: School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA – sequence: 9 givenname: Charles M surname: Marcus fullname: Marcus, Charles M organization: Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark – sequence: 10 givenname: Ferdinand surname: Kuemmeth fullname: Kuemmeth, Ferdinand organization: Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/28498694$$D View this record in MEDLINE/PubMed |
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