- Conference date: 6-12 March 2006
- Location: Kanpur (India)
The decoherence of a spin‐1/2 particle (qubit) interacting with a nuclear spin bath in quantum dots has been studied using an isotropic Heisenberg model. An effective magnetic field (a feature of unitary evolution) and an effective temperature (a non‐unitary feature) describe the effective dynamics of the qubit. The decoherence time scale is calculated as a function of the nuclear bath spin distribution and the nuclear polarizations in various spin channels. The averaged auto correlation function of the qubit spin, averaged over all possible initial states of the qubit, depends on the nuclear spin distribution, but is insensitive to the nuclear polarizations.
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