Composed Effects of Electron-Hole Exchange and Near-Field Interaction in Quantum-Dot-Confined Radiative Dipoles

Abstract

Conservation of polarization is an important requirement for reliable single-photon emitters, which, in turn, are essential building blocks for light-based quantum information processing. In this work, we study the exciton-spin dynamics in a double quantum dot under the combined effects of electron-hole exchange and Förster resonance energy transfer. By means of numerical solutions of the quantum master equation, we simulate the time-dependent spin polarization for two neighboring dots. According to our results, under some conditions, the depolarization caused by the electron-hole exchange may be slowed by the near field-induced interdot energy transfer, suggesting a new mechanism to extend the exciton coherence time. This opens doors to alternative schemes for improved solid-state quantum light sources.

Effects of the Exciton Fine Structure Splitting on the Entanglement-Based Quantum Key Distribution

“…Once the indistinguishability of quantum particles is considered, the exchange part of the electron-hole (e-h) Coulomb interaction, which is spin-dependent, plays an important role by breaking up the degeneracy and producing an energy splitting between the exciton states of different spins [22][23][24][25]. This is illustrated in Figure 1c.…”