Three-stage decoherence dynamics of an electron spin qubit in an optically active quantum dot

Bechtold, Alexander; Rauch, Dominik; Li, Fuxiang; Simmet, Tobias; Ardelt, Pier-Lennart; Regler, Armin; Muller, Kai; Sinitsyn, Nikolai A.; Finley, Jonathan J.

doi:10.1038/nphys3470

Title: Three-stage decoherence dynamics of an electron spin qubit in an optically active quantum dot

Journal Article · Mon Sep 21 00:00:00 EDT 2015 · Nature Physics

DOI:https://doi.org/10.1038/nphys3470· OSTI ID:1492646

Bechtold, Alexander ^[1]; Rauch, Dominik ^[1];

^[2]; Simmet, Tobias ^[1]; Ardelt, Pier-Lennart ^[1]; Regler, Armin ^[3]; Muller, Kai ^[3];

^[2]; Finley, Jonathan J. ^[1]

Technische Universität München, Garching (Germany)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Technische Universität München, Garching (Germany); Stanford Univ., CA (United States)

We report the control of solid-state qubits requires a detailed understanding of the decoherence mechanisms. Despite considerable progress in uncovering the qubit dynamics in strong magnetic fields, decoherence at very low magnetic fields remains puzzling, and the role of quadrupole coupling of nuclear spins is poorly understood. For spin qubits in semiconductor quantum dots, phenomenological models of decoherence include two basic types of spin relaxation: fast dephasing due to static but randomly distributed hyperfine fields (~2 ns) and a much slower process (>1 μs) of irreversible monotonic relaxation due either to nuclear spin co-flips or other complex many-body interaction effects. Here we show that this is an oversimplification; the spin qubit relaxation is determined by three rather than two distinct stages. Finally, the additional stage corresponds to the effect of coherent precession processes that occur in the nuclear spin bath itself, leading to a relatively fast but incomplete non-monotonic relaxation at intermediate timescales (~750 ns).

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396

OSTI ID:: 1492646

Report Number(s):: LA-UR-15-24203

Journal Information:: Nature Physics, Vol. 11, Issue 12; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 87 works

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