Quantum decoherence dynamics of divacancy spins in silicon carbide
Abstract
Long coherence times are key to the performance of quantum bits (qubits). Here, we experimentally and theoretically show that the Hahn-echo coherence time of electron spins associated with divacancy defects in 4H-SiC reaches 1.3 ms, one of the longest Hahn-echo coherence times of an electron spin in a naturally isotopic crystal. Using a first-principles microscopic quantum-bath model, we find that two factors determine the unusually robust coherence. First, in the presence of moderate magnetic fields (30mT and above), the 29Si and 13C paramagnetic nuclear spin baths are decoupled. In addition, because SiC is a binary crystal, homo-nuclear spin pairs are both diluted and forbidden from forming strongly coupled, nearest-neighbour spin pairs. Longer neighbour distances result in fewer nuclear spin flip-flops, a less fluctuating intra-crystalline magnetic environment, and thus a longer coherence time. Lastly, our results point to polyatomic crystals as promising hosts for coherent qubits in the solid state.
- Authors:
-
- The Univ. of Chicago, Chicago, IL (United States)
- The Univ. of Chicago, Chicago, IL (United States); IBM T.J. Watson Research Center, Yorktown Heights, NY (United States)
- The Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- University of Chicago - Materials Research Science & Engineering Center (MRSEC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences and Engineering Division; National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR)
- OSTI Identifier:
- 1332927
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 7; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; electronic structure; quantum physics; qubits; semiconductors
Citation Formats
Seo, Hosung, Falk, Abram L., Klimov, Paul V., Miao, Kevin C., Galli, Giulia, and Awschalom, David D. Quantum decoherence dynamics of divacancy spins in silicon carbide. United States: N. p., 2016.
Web. doi:10.1038/ncomms12935.
Seo, Hosung, Falk, Abram L., Klimov, Paul V., Miao, Kevin C., Galli, Giulia, & Awschalom, David D. Quantum decoherence dynamics of divacancy spins in silicon carbide. United States. https://doi.org/10.1038/ncomms12935
Seo, Hosung, Falk, Abram L., Klimov, Paul V., Miao, Kevin C., Galli, Giulia, and Awschalom, David D. Thu .
"Quantum decoherence dynamics of divacancy spins in silicon carbide". United States. https://doi.org/10.1038/ncomms12935. https://www.osti.gov/servlets/purl/1332927.
@article{osti_1332927,
title = {Quantum decoherence dynamics of divacancy spins in silicon carbide},
author = {Seo, Hosung and Falk, Abram L. and Klimov, Paul V. and Miao, Kevin C. and Galli, Giulia and Awschalom, David D.},
abstractNote = {Long coherence times are key to the performance of quantum bits (qubits). Here, we experimentally and theoretically show that the Hahn-echo coherence time of electron spins associated with divacancy defects in 4H-SiC reaches 1.3 ms, one of the longest Hahn-echo coherence times of an electron spin in a naturally isotopic crystal. Using a first-principles microscopic quantum-bath model, we find that two factors determine the unusually robust coherence. First, in the presence of moderate magnetic fields (30mT and above), the 29Si and 13C paramagnetic nuclear spin baths are decoupled. In addition, because SiC is a binary crystal, homo-nuclear spin pairs are both diluted and forbidden from forming strongly coupled, nearest-neighbour spin pairs. Longer neighbour distances result in fewer nuclear spin flip-flops, a less fluctuating intra-crystalline magnetic environment, and thus a longer coherence time. Lastly, our results point to polyatomic crystals as promising hosts for coherent qubits in the solid state.},
doi = {10.1038/ncomms12935},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Thu Sep 29 00:00:00 EDT 2016},
month = {Thu Sep 29 00:00:00 EDT 2016}
}
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