Abstract

The spin degrees of freedom in quantum dots (QDs) of He‐type embedded in diluted magnetic semiconductor (DMS) medium are considered for modelling of qubit and gate for quantum information processing (QIP). The qubit is defined as a singlet and triplet pair of states of two electrons in He QD. Methods of qubit rotations and two‐qubit operations are considered. Decoherence due to spin waves in magnetically ordered phase of DMS is however recognized as the the source of unavoidable dephasing with inconvenient, from point of view of the DiVincenzo conditions, time‐scale.

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