Frequency Bin Entangled Photons

TL;DR

This paper demonstrates the generation and experimental manipulation of frequency bin entangled photons at telecommunication wavelengths, showing coherent control over multiple frequency bins and violation of Bell inequalities.

Contribution

It introduces the concept of frequency bin entanglement and experimentally shows coherent addressing of up to eleven frequency bins using fiber optics components.

Findings

Coherent addressing of eleven frequency bins.

Violation of Bell inequality by more than five standard deviations.

Experimental validation of frequency bin entanglement at 1550 nm.

Abstract

A monochromatic laser pumping a parametric down conversion crystal generates frequency entangled photon pairs. We study this experimentally by addressing such frequency entangled photons at telecommunication wavelengths (around 1550 nm) with fiber optics components such as electro-optic phase modulators and narrow band frequency filters. The theory underlying our approach is developed by introducing the notion of frequency bin entanglement. Our results show that the phase modulators address coherently up to eleven frequency bins, leading to an interference pattern which can violate a Bell inequality adapted to our setup by more than five standard deviations.