Related Experiment Video
Updated: Jun 22, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Biphoton interference with a quantum dot entangled light source
R M Stevenson1, A J Hudson, R J Young
1Toshiba Research Europe Limited, 260 Cambridge Science Park, Cambridge CB4 0WE, UK. mark.stevenson@crl.toshiba.co.uk
Abstract:
We demonstrate optical interferometry beyond the limits imposed by the photon wavelength using 'triggered' entangled photon pairs from a semiconductor quantum dot. Interference fringes of the entangled biphoton state reveals a periodicity half of that obtained with the single photon, and much less than that of the pump laser. High fringe visibility indicates that biphoton interference is less sensitive to decoherence than interference of two sequential single photons. The results suggest that quantum interferometry may be possible using a semiconductor LED-like device.
Related Concept Videos
Interference and Diffraction
The de Broglie Wavelength
Atomic Emission Spectroscopy: Interference
Photoelectric Effect

