Dynamical control of electron spin coherence in a quantum dot

Details Dynamical control of electron spin coherence in a quantum dot Dynamical control of electron spin coherence in a quantum dot

2007-01-21

arxiv.org/abs/cond-mat/0701507v1

Phys. Rev. B 75, 201302(R) (2007).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures with 3 of them in color

Scientific paper

10.1103/PhysRevB.75.201302

We investigate the performance of dynamical decoupling methods at suppressing electron spin decoherence from a low-temperature nuclear spin reservoir in a quantum dot. The controlled dynamics is studied through exact numerical simulation, with emphasis on realistic pulse delays and long-time limit. Our results show that optimal performance for this system is attained by a periodic protocol exploiting concatenated design, with control rates substantially slower than expected from the upper spectral cutoff of the bath. For a known initial electron spin state, coherence can saturate at long times, signaling the creation of a stable ``spin-locked'' decoherence-free subspace. Analytical insight on saturation is obtained for a simple echo protocol, in good agreement with numerical results.

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