Non-classical correlation of cascaded photon pairs emitted from quantum dot

TL;DR

This paper investigates the quantum correlation behavior of photon pairs emitted from quantum dots, focusing on the temperature-dependent sudden change in correlation and its independence from background noise, offering insights for experimental observation.

Contribution

It provides the first detailed analysis of the temperature-dependent sudden change in quantum correlation of photon pairs from quantum dots, linking it to fine structure splitting.

Findings

Correlation sudden change temperature is independent of background noise.

This temperature is much lower than entanglement sudden death temperature.

The phenomenon is more observable than entanglement sudden death.

Abstract

We studied the quantum correlation between the photon pairs generated by biexciton cascade decays of self-assembled quantum dots, and determined the temperature behavior associated with so-called sudden change of the quantum correlation. The relationship between the fine structure splitting and the sudden change temperature is also provided. Our study indicates that this correlation behavior sudden change temperature is independent on the back ground noise in the system and far lower than entanglement sudden death temperature, therefore it should be easier to observe the phenomenon of correlation sudden change in experiments than to observe entanglement sudden death.