Polarization-Entangled Light Pulses of 10^5 Photons

TL;DR

This paper demonstrates polarization entanglement in bright squeezed vacuum pulses with over 10^5 photons and explores photon-number entanglement, highlighting potential applications in quantum technologies.

Contribution

It provides the first experimental demonstration of polarization entanglement in extremely bright squeezed vacuum pulses containing over 10^5 photons.

Findings

Polarization entanglement achieved in pulses with >10^5 photons

Photon-number entanglement quantified via Schmidt number

Brighter pulses exhibit higher entanglement

Abstract

We experimentally demonstrate polarization entanglement for squeezed vacuum pulses containing more than 10^5 photons. We also study photon-number entanglement by calculating the Schmidt number and measuring its operational counterpart. Theoretically, our pulses are the more entangled the brighter they are. This promises important applications in quantum technologies, especially photonic quantum gates and quantum memories.