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Fiber-based biphoton source with ultrabroad frequency tunability

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López-Huidrobro,  Santiago
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
International Max Planck Research School, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nürnberg;

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Lippl,  Markus
Joly Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nürnberg;

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Joly,  Nicolas
Joly Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nürnberg;
Interdisciplinary Centre for Nanostructured Films;

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Chekhova,  Maria
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nürnberg;

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Citation

López-Huidrobro, S., Lippl, M., Joly, N., & Chekhova, M. (2021). Fiber-based biphoton source with ultrabroad frequency tunability. Optics Letters, 46(16), 4033-4036. doi:10.1364/OL.434434.


Cite as: http://hdl.handle.net/21.11116/0000-0009-2069-D
Abstract
Tunable biphotons are highly important for a wide range of quantum applications. For some applications, especially interesting are cases where two photons of a pair are far apart in frequency. Here, we report a tunable biphoton source based on a xenon-filled hollow-core photonic crystal fiber. Tunability is achieved by adjusting the pressure of the gas inside the fiber. This allows us to tailor the dispersion landscape of the fiber, overcoming the principal limitations of solid-core fiber-based biphoton sources. We report a maximum tunability of 120 THz for a pressure range of 4 bar with a continuous shift of 30 THz/bar. At 21 bar, the photons of a pair are separated by more than one octave. Despite the large separation, both photons have large bandwidths. At 17 bar, they form a very broad (110 THz) band around the frequency of the pump.