Non-Markovian band-edge effect and entanglement generation of quantum dot excitons coupled to nanowire surface plasmons

TL;DR

This paper theoretically studies how quantum dot excitons decay into nanowire surface plasmons, revealing non-Markovian effects and potential for generating entangled states useful in quantum information.

Contribution

It introduces a detailed analysis of non-Markovian dynamics and entanglement generation of quantum dot excitons coupled to nanowire surface plasmons.

Findings

Enhanced radiative decay at specific bandgaps

Observation of non-Markovian exciton dynamics

Potential for remote entanglement generation

Abstract

The radiative decay of quantum dot (QD) excitons into surface plasmons in a cylindrical nanowire is investigated theoretically. Maxwell's equations with appropriate boundary conditions are solved numerically to obtain the dispersion relations of surface plasmons. The radiative decay rate of QD excitons is found to be greatly enhanced at certain values of the exciton bandgap. Analogous to the decay of a two-level atom in the photonic crystal, we first point out that such an enhanced phenomenon allows one to examine the non-Markovian dynamics of the QD exciton. Besides, due to the one dimensional propagating feature of nanowire surface plasmons, remote entangled states can be generated via super-radiance and may be useful in future quantum information processing.