Quantum Decoherence Dynamics of Divacancy Spins in Silicon Carbide

Overview

Journal Nat Commun

Specialty Biology

Date 2016 Sep 30

PMID 27679936

Citations 17

Authors

Hosung Seo

Abram L Falk

Paul V Klimov

Kevin C Miao

Giulia Galli

David D Awschalom

Affiliations

Soon will be listed here.

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 Si and C 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.

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