Abstract:
:We theoretically investigate the problem of finding optimal characteristics of photon pairs, produced in the spontaneous parametric down-conversion (SPDC) process, for fiber-based quantum communication protocols. By using the accessible setup parameters, the pump pulse duration and the extended phase-matching function width, we minimize the temporal width of SPDC photons within the general scenario. This allows one to perform more effectively the temporal filtering procedure, which aims at reducing the noise acquired by the measurement devices. Moreover, we compare the obtained results with the achievable parameter values for SPDC sources based on [Formula: see text]-Barium Borate crystal. We also investigate the influence of non-zero detection timing jitter. Finally, we apply our optimization strategy to a simple quantum key distribution scheme to show that the full optimization of an SPDC source can potentially extend the maximal security distance by several tens of kilometres, which is around 30% more as compared to previous approaches.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Lasota M,Kolenderski Pdoi
10.1038/s41598-020-77662-2subject
Has Abstractpub_date
2020-11-30 00:00:00pages
20810issue
1issn
2045-2322pii
10.1038/s41598-020-77662-2journal_volume
10pub_type
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