Dynamics and decoherence in the central spin model using exact methods

Details Dynamics and decoherence in the central spin model using exact methods Dynamics and decoherence in the central spin model using exact methods

2010-04-30

arxiv.org/abs/1005.0001v3

Phys. Rev. B 82, 161308(R) (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures. Published version. See also http://www.physik.uni-kl.de/eggert/papers/index.html

Scientific paper

10.1103/PhysRevB.82.161308

The dynamics and decoherence of an electronic spin-1/2 qubit coupled to a bath of nuclear spins via hyperfine interactions in a quantum dot is studied. We show how exact results from the integrable solution can be used to understand the dynamic behavior of the qubit. It is possible to predict the main frequency contributions and their broadening for relatively general initial states analytically, leading to an estimate of the corresponding decay times. Furthermore, for a small bath polarization, a new low-frequency time scale is observed.

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