Low-noise short-wavelength pumped frequency downconversion for quantum frequency converters
Jan Fabian Geus (RWTH Aachen University, Fraunhofer Institute for Laser Technology (ILT))
Florian Elsen (RWTH Aachen University, Fraunhofer Institute for Laser Technology (ILT))
Sebastian Nyga (Fraunhofer Institute for Laser Technology (ILT))
A.J. Stolk (TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Hanson Lab, Kavli institute of nanoscience Delft)
K.L. van der Enden (TU Delft - QID/Hanson Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
E.J. Van Zwet (TU Delft - BUS/TNO STAFF, TU Delft - QuTech Advanced Research Centre, TNO)
Constantin Haefner (Fraunhofer Institute for Laser Technology (ILT), University Hospital RWTH Aachen)
R Hanson (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QN/Hanson Lab, TU Delft - QID/Hanson Lab)
Bernd Jungbluth (Fraunhofer Institute for Laser Technology (ILT))
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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.
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