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Related Experiment Video

Updated: Jul 16, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Quantum frequency conversion using 4-port fiber-pigtailed PPLN module.

Shoichi Murakami, Rintaro Fujimoto, Toshiki Kobayashi

|September 15, 2023

Summary

This summary is machine-generated.

This study presents a compact quantum frequency conversion (QFC) module using a periodically poled lithium niobate waveguide. The module efficiently shifts single photons

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Last Updated: Jul 16, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Area of Science:

Quantum Optics
Quantum Information Science
Photonics

Background:

Quantum frequency conversion (QFC) is crucial for quantum interconnects, especially within telecom photonic networks.
Compact, fiber-coupled QFC modules are essential for practical quantum applications.

Purpose of the Study:

To develop and demonstrate a compact, fiber-coupled quantum frequency conversion module.
To enable efficient wavelength shifting of single photons for quantum networking.

Main Methods:

Utilized a fiber-coupled 4-port frequency converter based on a periodically poled lithium niobate (PPLN) waveguide.
Employed spontaneous parametric down-conversion (SPDC) to generate and detect heralded single photons.
Measured cross-correlation functions to verify quantum properties before and after QFC.

Main Results:

Successfully shifted a single photon's wavelength from 780 nm to 1541 nm with high fidelity.
Achieved a high cross-correlation function of 40.45 ± 0.09 for heralded photons.
Demonstrated a nonclassical cross-correlation value of 13.7 ± 0.4 after QFC, preserving quantum statistics.
Attained a maximum device efficiency of 0.73.

Conclusions:

The developed QFC module is compact, fiber-closed, and highly efficient.
This technology facilitates the interfacing of atomic quantum systems with fiber-optic communication networks.
The preserved quantum statistical properties are vital for advanced quantum communication protocols.