Polarization entangled photons from quantum dots embedded in nanowires

TL;DR

This paper reports the first measurement of polarization-entangled photons emitted from a single quantum dot in a nanowire, demonstrating significant entanglement fidelity and concurrence.

Contribution

It introduces a novel system of quantum dots in nanowires for generating polarization-entangled photons and provides the first experimental measurement of their entanglement properties.

Findings

Fidelity of 0.76 to a maximally entangled state

Concurrence of 0.57 indicating strong entanglement

First measurement of entanglement from this quantum dot system

Abstract

We present a first measurement of photon polarization entanglement from the biexciton to ground state cascade of a single InAsP quantum dot embedded in an InP nanowire. We observe a fidelity of 0.76(2) to a reference maximally entangled state as well as a concurrence of 0.57(6).