Abstract
AbstractWe outline a scheme to create a “dark” state by three‐level mixing that is potentially a useful tool for quantum coherent transport. Magnetic‐field‐induced intra‐dot level mixing can lead to rich quantum superposition phenomena between three approaching single‐particle states in a quantum dot when probed by the ground state of an adjacent weakly coupled quantum dot in the single‐electron resonant tunnelling regime. The mixing relies on non‐negligible anharmonicity and anisotropy in confining potentials of realistic quantum dots. Anti‐crossing and transfer of strengths between resonances can be understood with a simple coherent level mixing model. Superposition can lead to the formation of a dark state by complete cancellation of an otherwise strong resonance. This is an all‐electrical analogue of coherent population trapping seen in three‐level‐systems from quantum and atom optics. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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