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Triplet Fusion Upconversion Nanocapsule Synthesis

Triplet Fusion Upconversion Nanocapsule Synthesis

Published on: September 7, 2022

Dual-channel, single-photon upconversion detector at 1.3 μm.

J S Pelc¹, Paulina S Kuo, Oliver Slattery

¹E L Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. jpelc@stanford.edu

|October 6, 2012

Summary

Researchers developed a dual-channel upconversion detector for counting 1300-nm photons. This novel system uses sum-frequency generation (SFG) for efficient photon detection and has applications in quantum communications.

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Area of Science:

Quantum optics
Nonlinear optics
Photonics

Background:

Efficient photon detection is crucial for quantum information processing.
Upconversion detectors offer a pathway to convert infrared photons to detectable visible wavelengths.

Purpose of the Study:

To demonstrate a two-channel upconversion detector for 1300-nm photons.
To explore its potential applications in quantum communications.

Main Methods:

Utilized sum-frequency generation (SFG) in a periodically poled lithium niobate (PPLN) waveguide.
Employed two pump lasers near 1550 nm to convert 1300-nm photons to two distinct channels near 710 nm.
Engineered a phase-modulated PPLN waveguide for simultaneous quasi-phasematching of two SFG processes.

Main Results:

Achieved 31% and 25% full-system photon detection efficiency in the two channels.
Recorded very low dark count rates (650 and 550 counts per second).
Reached a peak external conversion efficiency of 70% with volume Bragg grating filtering.

Conclusions:

The developed dual-channel upconversion detector shows high efficiency and low noise.
Potential applications include frequency-shifting beamsplitters and time-to-frequency converters for enhanced quantum communication data rates.