Current detection of superradiance and induced entanglement of double quantum dot excitons

TL;DR

This paper investigates superradiance and entanglement in double quantum dot excitons by measuring current oscillations and photon trapping effects, revealing new ways to control quantum emission and entanglement.

Contribution

It introduces a method to detect superradiance via current measurements and demonstrates photon trapping-induced entanglement in double quantum dots.

Findings

Current oscillates with inter-dot distance

Microcavity enhances oscillation amplitude

Photon trapping suppresses emission at small distances

Abstract

We propose to measure the superradiance effect by observing the current through a semiconductor double-dot ststem. An electron and a hole are injected separately into one of the quantum dots to form an exciton and then recombine radiatively. We find that the stationary current shows oscillatory behavior as one varies the inter-dot distance. The amplitude of oscillation can be increased by incorporating the system into a microcavity. Furthermore, the current is suppressed if the dot distance is small compared to the wavelength of the emitted photon. This photon trapping phenomenon generates the entangled state and may be used to control the emission of single photons at predetermined times.