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Multiple-DWDM-channel heralded single-photon source based on a periodically poled lithium niobate waveguide
Optics Express
|August 9, 2017
Summary
We developed a new single-photon source for quantum networks. This device efficiently generates single photons across many telecom channels, significantly reducing multi-photon noise for secure communication.
Area of Science:
- Quantum Optics
- Photonics
- Quantum Information Science
Background:
- Heralded single-photon sources are crucial for quantum communication.
- Existing sources often lack the spectral flexibility and efficiency needed for practical quantum networks.
Purpose of the Study:
- To experimentally realize a novel heralded single-photon source.
- To demonstrate its suitability for dense wavelength-division multiplexing (DWDM) quantum networks.
Main Methods:
- Utilized a periodically poled lithium niobate waveguide.
- Employed a 50 MHz pulsed laser for pumping.
- Characterized photon generation efficiency and multi-photon emission probability across multiple ITU grid channels.
Main Results:
- Achieved a heralded single-photon source covering over 40 DWDM channels at telecom wavelengths.
- Demonstrated virtually identical efficiencies across all channels.
- Reduced multi-photon emission probability by over 150 times compared to a Poissonian source.
- Integrated an all-fiber structure for practical deployment.
Conclusions:
- The developed source is highly suitable for real-world quantum networks due to its spectral coverage, efficiency, and low noise.
- The 50 MHz data rate is compatible with current quantum communication systems.
- The source can be pumped at higher repetition rates for increased performance.
