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Tunable up-conversion single-photon detector at telecom wavelengths.

Jin-Woo Chae¹, Jin-Hun Kim¹, Youn-Chang Jeong¹

¹Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

This summary is machine-generated.

We developed a tunable up-conversion single-photon detector (UCSPD) that covers the entire telecom C band. This breakthrough enhances UCSPD suitability for advanced quantum communication networks utilizing wavelength multiplexing.

Keywords:

frequency up-conversion quantum communication single-photon detector sum-frequency generation telecom C band

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Area of Science:

Quantum optics
Photonics
Quantum communication

Background:

Up-conversion single-photon detectors (UCSPDs) convert telecom band photons to near-infrared wavelengths for detection by silicon detectors.
Current UCSPDs have limited, fixed wavelength ranges, hindering applications in wavelength-multiplexed quantum networks.
Silicon single-photon detectors offer high dynamic range, making them suitable for high-speed quantum communication.

Purpose of the Study:

To develop a tunable UCSPD module.
To enable UCSPDs to cover the complete telecom C band.
To enhance UCSPD applicability in wavelength-multiplexed quantum communication networks.

Main Methods:

Utilized sum-frequency generation for photon up-conversion.
Engineered a UCSPD module with tunable wavelength detection capabilities.
Characterized the module's performance across the telecom C band.

Main Results:

Demonstrated a tunable UCSPD module covering the full telecom C band.
Overcame the limitation of narrow, fixed detection windows in previous UCSPDs.
Validated the module's suitability for quantum communication networks employing wavelength multiplexing.

Conclusions:

The tunable UCSPD module significantly expands the application scope of up-conversion technology.
This advancement is crucial for developing scalable and versatile quantum communication networks.
Enables efficient sharing of wavelength-multiplexed entangled photons for quantum information processing.