Entanglement dynamics of photon pairs emitted from quantum dot
Yang Zou, Ming Gong, Chuan-Feng Li, Geng Chen, Jian-Shun Tang and, Guang-Can Guo
TL;DR
This paper models the entanglement dynamics of photon pairs emitted from quantum dots, revealing how temperature affects entanglement and identifying the relationship between fine structure splitting and entanglement sudden death.
Contribution
The paper introduces a model that accurately predicts the entangled photon state from quantum dots and analyzes temperature effects on entanglement.
Findings
Entanglement decreases with increasing temperature.
Entanglement sudden death occurs at high temperatures.
Fine structure splitting influences the temperature threshold for entanglement loss.
Abstract
We present a model to derive the state of the photon pairs generated by the biexciton cascade decay of a self-assembled quantum dot, which agrees well with the experimental result. Furthermore we calculate the concurrence and entanglement sudden death is found in this system with temperature increasing, which prevents quantum dot emits entangled photon pairs at a high temperature. The relationship between the fine structure splitting and the sudden death temperature is provided too.
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