Phase Compensation Enhancement of Photon Pair Entanglement Generated from Biexciton Decays in Quantum Dots

TL;DR

This paper proposes a practical phase compensation method using a spatial light modulator to improve photon pair entanglement from quantum dots by addressing phase differences caused by exciton fine-structure splittings.

Contribution

It introduces a frequency domain analysis and a phase compensation technique with a spatial light modulator to enhance entanglement without loss.

Findings

Significant improvement in photon pair entanglement quality.

Phase difference compensation achieved with a spatial light modulator.

Method applicable without introducing loss.

Abstract

Exciton fine-structure splittings within quantum dots introduce phase differences between the two biexciton decay paths that greatly reduce the entanglement of photon pairs generated via biexciton recombination. We analyze this problem in the frequency domain and propose a practicable method to compensate the phase difference by inserting a spatial light modulator, which substantially improves the entanglement of the photon pairs without any loss.