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Dynamics and decoherence in the central spin model using exact methods

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arxiv 1005.0001 v3 pith:BEO3G3KI submitted 2010-04-30 cond-mat.str-el cond-mat.dis-nncond-mat.mes-hallquant-ph

classification cond-mat.str-elcond-mat.dis-nncond-mat.mes-hallquant-ph
keywords bathdecoherencedynamicsexactqubitanalyticallybehaviorbroadening
verification ladder T0 review T1 audit T2 compute T3 formal
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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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