Turn-Key Diode-Pumped All-Fiber Broadband Polarization-Entangled Photon Source

TL;DR

This paper presents a compact, low-power, all-fiber polarization-entangled photon source that is stable, portable, and offers high-quality entanglement suitable for quantum communication applications.

Contribution

It introduces a novel, all-fiber, diode-pumped entangled photon source with broad spectrum, high stability, and turn-key operation, advancing practical quantum photonics.

Findings

Broad biphoton spectrum over 100nm

Concurrence greater than 0.96 for polarization entanglement

Stable operation over 10 hours with high coincidence-to-accidental ratio

Abstract

In this letter, we report a compact, low-power laser diode-pumped, all-fiber polarization-entangled photon pair source based on periodically-poled silica fiber technology. The all-fiber source offers room-temperature, alignment-free, turn-key operation, with low power consumption, and is packaged into a fanless, portable enclosure. It features a broad biphoton spectrum of more than 100nm with a concurrence that is greater than 0.96 for polarization entanglement. The source is stable over at least 10 hours of continuous operation, achieving coincidence-to-accidental ratios of more than 2000 consistently over this time period.