Time-bin Entanglement from Quantum Dots

TL;DR

This paper discusses generating time-bin entangled photon pairs from quantum dots, highlighting the process of preparing quantum dots in specific states and using interferometers, with potential for hyper-entanglement.

Contribution

It introduces methods for creating time-bin entanglement from quantum dots and extends the approach to hyper-entanglement involving polarization.

Findings

Demonstrates coherent preparation of quantum dots in the biexciton state.

Describes the use of specialized interferometers for analysis.

Proposes extension to time-bin and polarization hyper-entanglement.

Abstract

The desire to have a source of single entangled photon pairs can be satisfied using single quantum dots as emitters. However, we are not bound to pursue only polarization entanglement, but can also exploit other degrees of freedom. In this chapter we focus on the time degree of freedom, to achieve so-called time-bin entanglement. This requires that we prepare the quantum dot coherently into the biexciton state and also build special interferometers for analysis. Finally this technique can be extended to achieve time-bin and polarization hyper-entanglement from a suitable quantum dot.