Frequency down-conversion for efficient, low-noise quantum frequency converters

Geus, Jan Fabian; Elsen, Florian; Nyga, Sebastian; Jungbluth, Bernd; Hoffmann, Hans-Dieter; Haefner, C.

doi:10.1117/12.2607750

Cited by 1 publication

(2 citation statements)

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“…The experimental setup is depicted in figure 1. It is based on the setup firstly proposed and investigated in [42]. For this work, it is optimized targeting increased conversion efficiency and coupling efficiency of the converted wave into the single-mode optical fiber.…”

Section: Methodsmentioning

confidence: 99%

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

Geus,

Elsen,

Nyga

et al. 2024

Optica Quantum

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In this paper, we present a novel single stage quantum frequency conversion (QFC) scheme based on an enhancement cavity, which allows for high conversion efficiencies with record low noise levels, 100 times smaller than in previous systems and close to the thermal background. Our approach represents a significant improvement over traditional QFC methods that rely on periodically poled waveguide crystals, which typically produce high levels of noise with input wavelengths in the visible spectrum.One of the key challenges in QFC is the generation of noise photons -photons that are not part of the desired output state. Those noise photons are one of the major limitations of today's quantum network experiments. It has been widely believed that single stage QFC of qubit photons in the visible range would result in too many noise photons in the telecom band, because of SPDC induced by the short wavelength driver laser. However, using the enhancement cavity design, we are able to overcome this challenge and demonstrate high-fidelity QFC from the visible to telecom band.Our results have important implications for the development of practical QFC devices for a range of applications, including quantum communication and quantum networks, where low noise levels are critical.

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Section: Methodsmentioning

confidence: 99%

“…Figure 1 (compare [42]): Schematic drawing of the QFC setup. The enhancement cavity consists of four mirrors (Mc) of which one is mounted to a piezoelectric actor to control the cavity length.…”

Section: Methodsmentioning

confidence: 99%