Low-noise short-wavelength pumped frequency downconversion for quantum frequency converters

Journal article (2024)

Authors

Jan Fabian Geus Rheinisch-Westfälische Technische Hochschule, Fraunhofer Institute for Laser Technology (ILT)
Florian Elsen Rheinisch-Westfälische Technische Hochschule, Fraunhofer Institute for Laser Technology (ILT)
Sebastian Nyga Fraunhofer Institute for Laser Technology (ILT)
A.J. Stolk QuTech Advanced Research Centre, QID/Hanson Lab, Kavli institute of nanoscience Delft
K.L. van der Enden QID/Hanson Lab, Kavli institute of nanoscience Delft, QuTech Advanced Research Centre
E.J. van Zwet BUS/TNO STAFF, QuTech Advanced Research Centre, TNO
Constantin Haefner Fraunhofer Institute for Laser Technology (ILT), University Hospital RWTH Aachen
R Hanson QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, QN/Hanson Lab, QID/Hanson Lab
Bernd Jungbluth Fraunhofer Institute for Laser Technology (ILT)
Research Group
QID/Hanson Lab
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Published Date

2024

Language

English

Research Group

QID/Hanson Lab

Abstract

We present a highly efficient low-noise quantum frequency converter from the visible range to telecom wavelengths, combining a pump laser at intermediate frequency resonantly enhanced in an actively stabilized cavity with a monocrystalline bulk crystal. A demonstrator for photons emitted by nitrogen-vacancy-center qubits achieves 43% external efficiency with a noise photon rate per wavelength (frequency) band of 2 s−1/pm(17 s−1/GHz) – reducing the noise by two orders of magnitude compared with current devices based on periodically poled crystals with waveguides. With its tunable output wavelength, this device enables the generation of indistinguishable telecom photons from different network nodes and is, as such, a crucial component for a future quantum internet based on optical fiber.