Fiber based source of photon pairs at telecom band with high temporal coherence and brightness for quantum information processing

TL;DR

This paper presents a fiber-based, high-brightness, and highly coherent photon pair source at telecom wavelengths, suitable for quantum information processing, demonstrated through experimental measurements of coherence and interference.

Contribution

The work introduces a novel, bright pulsed photon pair source using dispersion shifted fiber with verified high coherence and interference capabilities.

Findings

High brightness and coherence of the photon pairs

Successful two-photon interference experiment

Potential for multi-photon quantum applications

Abstract

We experimentally demonstrate a bright pulsed source of correlated photon pairs at 1550 nm telecom band by pumping 300 m dispersion shifted fiber with a 4 ps pulse train. We investigate the coherence property of the source by measuring the second order intensity correlation function $g^{(2)}$ of individual signal (idler) photons. A preliminary Hong-Ou-Mandel type two-photon interference experiment with two such sources confirms the high temporal and spatial coherence of the source. The source is suitable for multi-photon quantum interference of independent sources, required in quantum information processing.