Related Experiment Video
Updated: Dec 7, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Heralded Distribution of Single-Photon Path Entanglement
P Caspar1, E Verbanis1, E Oudot1,2
1Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland.
Abstract:
We report the experimental realization of heralded distribution of single-photon path entanglement at telecommunication wavelengths in a repeater-like architecture. The entanglement is established upon detection of a single photon, originating from one of two spontaneous parametric down-conversion photon pair sources, after erasing the photon's which-path information. In order to certify the entanglement, we use an entanglement witness which does not rely on postselection. We herald entanglement between two locations, separated by a total distance of 2 km of optical fiber, at a rate of 1.6 kHz. This work paves the way towards high-rate and practical quantum repeater architectures.
Related Concept Videos
Dual Nature of Electromagnetic (EM) Radiation
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the number of...
Distribution and Dispersion
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

