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Continuous -time Fourier Transform

Continuous -time Fourier Transform

The Fourier series is instrumental in representing periodic functions, offering a powerful method to decompose such functions into a sum of sinusoids. This technique, however, necessitates modification when applied to nonperiodic functions. Consider a pulse-train waveform consisting of a series of rectangular pulses. When these pulses have a finite period, they can be accurately represented by a Fourier series. Yet, as the period approaches infinity, resulting in a single, isolated pulse, the...

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Related Experiment Video

Updated: May 5, 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

Optical frequency shifter based on continuous-wave pump fields.

Anica Hamer, Frank Vewinger, Michael H Frosz

|March 17, 2026

Summary

This summary is machine-generated.

Researchers achieved polarization-preserving frequency conversion for quantum information networks using hydrogen-loaded hollow-core fiber. This method shows promising efficiency for individual photon frequency conversion, with a clear path to near-unity efficiency.

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Last Updated: May 5, 2026

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Area of Science:

Quantum information science
Nonlinear optics
Photonics engineering

Background:

Quantum information networks necessitate efficient frequency conversion of single photons.
Molecular gases in nonlinear media offer broad spectral coverage and high efficiency for frequency conversion.
Hollow-core fibers provide a robust platform for nonlinear optical processes.

Purpose of the Study:

To demonstrate polarization-preserving frequency conversion of individual photons.
To investigate the use of hydrogen-loaded hollow-core fibers for this application.
To analyze limitations and identify pathways for efficiency enhancement.

Main Methods:

Utilized continuous-wave pump fields for frequency conversion.
Employed a hydrogen-loaded hollow-core fiber as the nonlinear medium.
Measured polarization preservation and conversion efficiency.

Main Results:

Achieved polarization-preserving frequency conversion with efficiencies in the per mille range.
Identified key limitations and loss mechanisms affecting conversion efficiency.
Proposed a method to significantly improve conversion efficiency.

Conclusions:

Hydrogen-loaded hollow-core fibers are a viable platform for polarization-preserving photon frequency conversion.
The demonstrated efficiency, while low, is a significant step towards practical quantum networks.
Further optimization offers a route to near-unity conversion efficiency, crucial for scalable quantum technologies.