Electric-field-induced coherent coupling of the exciton states in a single quantum dot

Abstract

The signature of coherent coupling between two quantum states is an anticrossing in their energies as one is swept through the other. In single semiconductor quantum dots containing an electron-hole pair the eigenstates form a two-level system that can be used to demonstrate quantum effects in the solid state, but in all previous work these states were independent. Here we describe a technique to control the energetic splitting of these states using a vertical electric field, facilitating the observation of coherent coupling between them. Near the minimum splitting the eigenstates rotate in the plane of the sample, being orientated at 45° when the splitting is smallest. Using this system we show direct control over the exciton states in one quantum dot, leading to the generation of entangled photon pairs.

References in corpus (8)

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• Inversion of exciton level splitting in quantum dots
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• Electro-elastic tuning of single particles in individual self-assembled quantum dots
• Non post-selected indistinguishable single photons generated by a quantum dot under resonant excitation
• Statistical study of stacked/coupled site-controlled pyramidal quantum dots and their excitonic properties
• Design of a 4-electrode optical device for application of vector electric fields to self-assembled quantum dot complexes
• Free induction decay of a superposition stored in a quantum dot
• Nonlocal biphoton generation in Werner state from a single semiconductor quantum dot
• Quantum statistics of four-wave mixing by a non-linear resonant microcavity