Single scatterings in single artificial atoms: Quantum coherence and entanglement

Details Single scatterings in single artificial atoms: Quantum coherence and entanglement Single scatterings in single artificial atoms: Quantum coherence and entanglement

2003-10-09

arxiv.org/abs/cond-mat/0310209v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages; to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.68.245304

We employ the quantum-jump approach to study single scatterings in single semiconductor quantum dots. Two prototypical situations are investigated. First, we analyze two-photon emissions from the cascade biexciton decay of a dot where the single-exciton states exhibit a fine-structure splitting. We show that this splitting results for appropriately chosen polarization filters in an oscillatory behavior of two-photon correlations, and carefully examine the proper theoretical description of the underlying scattering processes. Secondly, we analyze the decay of a single-electron charged exciton in a quantum dot embedded in a field effect structure. We show how the quantum properties of the charged exciton are transferred through tunneling and relaxation to the spin entanglement between electrons in the dot and contact, and identify the pertinent disentanglement mechanisms.

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