Abstract
AbstractThe spin degrees of freedom in quantum dot (QD) embedded in a diluted magnetic semiconductor (DMS) medium are considered in a model of a qubit and a gate for quantum information processing (QIP). The qubit is defined as a singlet and triplet pair of states of two electrons in a He‐type QD in the DMS medium with strongly enhanced gyromagnetic factor. Methods of qubit rotation (Rabi oscillations) as well as two‐qubit operations are suggested and analyzed. Moreover, decoherence related to spin waves (magnon‐induced dephasing) in this new system (QD in DMS) is studied, and the relevant time‐scale is estimated in accordance with preliminary experimental results. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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