Biphoton interference with a quantum dot entangled light source

TL;DR

This paper demonstrates biphoton interference using entangled photon pairs from a quantum dot, achieving sub-wavelength fringes and showing potential for quantum interferometry with semiconductor devices.

Contribution

It introduces a method to observe biphoton interference with semiconductor quantum dots, surpassing classical limits and indicating robustness against decoherence.

Findings

Interference fringes with half the wavelength of single photons.

High fringe visibility indicating low decoherence sensitivity.

Potential for quantum interferometry using semiconductor LEDs.

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.