A single eletron-photon pair generation from a single polarization-entangled photon pair

TL;DR

This paper demonstrates the generation of a single photo-electron in a quantum dot coincident with a single photon from a polarization-entangled photon pair, showcasing a step toward integrated quantum photonic-electronic systems.

Contribution

It introduces a method to generate and detect a single photo-electron and photon pair from polarization-entangled photons, highlighting a new approach for quantum information applications.

Findings

Higher coincidence probability with photo-electron detection

Coincident rate comparable to original photon pair emission rate

Successful generation of electron-photon pairs from entangled photons

Abstract

We demonstrate paired generation of a single photo-electron in a quantum dot and a single photon from a single polarization-entangled photon pair that is generated by spontaneous parametric down conversion. The electron is reated in a GaAs quantum dot via inter-band resonantexcitation by irradiating one of the paired photons on the dot, while the remaining photon is detected by a single photon counter. Because the paired photons are generated simultaneously, the photo-electron and the remaining photon should be observed as a coincident event if the traveling distance is equivalent between them. The coincidence is probabilistic due to the probabilistic generation of the paired photon. We observe the probability of finding the photon with the photo-electron detection substantially higher then that without the photo-electron detection and derive the coincident rate comparable to the emission rate of the original photon pairs.