On-demand Entanglement Source with Polarization-Dependent Frequency Shift

TL;DR

This paper introduces a polarization-dependent phase modulation technique to purify entangled photon pairs from quantum dots, effectively compensating phase errors and shifting photon frequencies based on polarization, compatible with current experimental setups.

Contribution

The paper presents a novel polarization-dependent frequency shift method for entanglement purification in quantum dot photon sources, enabling complete phase compensation.

Findings

Method can fully compensate phase errors in entanglement

Applicable with existing experimental setups

Enhances quality of entangled photon sources

Abstract

We propose a polarization-dependent spatial phase modulation method to purify the two-photon polarization entanglement generated by the biexciton cascade decay in a single semiconductor quantum dot. In principle, our method can completely compensate the random phase acquired from the decay of the non-degenerate exciton states in time domain. In frequency domain, our method is equivalent to shifting photon frequency according to its polarization. The method can be applied immediately by existing experimental set-ups.