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Related Experiment Video

Updated: May 11, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

A versatile source of single photons for quantum information processing.

Michael Förtsch¹, Josef U Fürst, Christoffer Wittmann

¹Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, Bau 24, Erlangen 91058, Germany.

Nature Communications

|May 9, 2013

Summary

This summary is machine-generated.

We developed a tunable, narrow-band single-photon source using a lithium niobate resonator. This efficient source is crucial for quantum communication and metrology applications.

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Area of Science:

Quantum Optics
Quantum Information Science
Materials Science

Background:

High-quality single-photon sources with controllable spectral properties are essential for interfacing quantum emitters with light.
Applications span quantum communication, quantum information processing, and quantum metrology.

Purpose of the Study:

To implement a fully tunable, narrow-band, and efficient single-photon source.
To leverage whispering gallery mode resonators for enhanced photon generation and control.

Main Methods:

Utilized a disk-shaped, monolithic lithium niobate whispering gallery mode resonator.
Employed a cavity-assisted spontaneous parametric down-conversion (SPDC) process.
Generated photon pairs emitted into tunable resonator modes.

Main Results:

Achieved wavelength tuning over 100 nm for both emitted modes.
Demonstrated controllable spectral bandwidths ranging from 7.2 to 13 MHz.
Verified single-photon generation via heralded anti-bunching with g(2)(0)<0.2.

Conclusions:

The developed resonator-based source offers high tunability and narrow bandwidth for single photons.
This technology is promising for efficient coupling in quantum systems.
The source facilitates advancements in fundamental quantum science and applied quantum technologies.