Quantum decoherence dynamics of divacancy spins in silicon carbide

Hosung Seo, Abram L. Falk, Paul V. Klimov, Kevin C. Miao, Giulia Galli and David D. Awschalom ()
Additional contact information
Hosung Seo: The Institute for Molecular Engineering, The University of Chicago
Abram L. Falk: The Institute for Molecular Engineering, The University of Chicago
Paul V. Klimov: The Institute for Molecular Engineering, The University of Chicago
Kevin C. Miao: The Institute for Molecular Engineering, The University of Chicago
Giulia Galli: The Institute for Molecular Engineering, The University of Chicago
David D. Awschalom: The Institute for Molecular Engineering, The University of Chicago

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: 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 (30 mT 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. Our results point to polyatomic crystals as promising hosts for coherent qubits in the solid state.

Date: 2016
References: Add references at CitEc
Citations: View citations in EconPapers (4)

Downloads: (external link)
https://www.nature.com/articles/ncomms12935 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12935

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/ncomms12935

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().