Optimal photon pairs for quantum communication protocols.

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 Rep

journal_title

Scientific reports

authors

Lasota M,Kolenderski P

doi

10.1038/s41598-020-77662-2

subject

Has Abstract

pub_date

2020-11-30 00:00:00

pages

20810

issue

1

issn

2045-2322

pii

10.1038/s41598-020-77662-2

journal_volume

10

pub_type

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