A flexible modular all-fiber based photon pair source for quantum key
distribution in a network
- URL: http://arxiv.org/abs/2309.12447v1
- Date: Thu, 21 Sep 2023 19:44:28 GMT
- Title: A flexible modular all-fiber based photon pair source for quantum key
distribution in a network
- Authors: Maximilian Tippmann, Erik Fitzke, Oleg Nikiforov, Philipp
Kleinpa{\ss}, Till Dolejsky, Maximilian Mengler and Thomas Walther
- Abstract summary: Entanglement-based QKD protocols require robust and stable photon pair sources.
We report on a flexible, tunable, alignment-free, all-fiber coupled photon source based on spontaneous down-conversion.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Entanglement-based QKD protocols require robust and stable photon pair
sources in terms of high heralding efficiencies or photon pair generation rates
even under harsh environmental conditions, e.g. when operated in the field. In
this paper, we report on a flexible, tunable, alignment-free, all-fiber coupled
photon source based on spontaneous parametric down-conversion in periodically
poled crystals. It can be operated in continuous-wave and pulsed modes,
respectively. Its rack-compatible and modular setup allows a straight forward
plug-and-play integration of coding-modules e.g. interferometers to enable
various QKD protocols such as phase or phase-time coding. We demonstrate
operation as a type-II and a type-0 SPDC stage proving the high flexibility of
our source. Furthermore, we demonstrate simultaneous operation of SHG and SPDC
in a double-pass configuration within the same nonlinear crystal further
simplifying the hardware requirements of our source. To evaluate the conversion
efficiencies of our modules, we employ data post-processing to remove artefacts
from detector afterpulsing and deadtimes of the detectors. We investigate the
source performance for various repetition rates.
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