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Main Title: Tools for the performance optimization of single-photon quantum key distribution
Author(s): Kupko, Timm
Helversen, Martin von
Rickert, Lucas
Schulze, Jan-Hindrik
Strittmatter, André
Gschrey, Manuel
Rodt, Sven
Reitzenstein, Stephan
Heindel, Tobias
Type: Article
Language Code: en
Abstract: Quantum light sources emitting triggered single photons or entangled photon pairs have the potential to boost the performance of quantum key distribution (QKD) systems. Proof-of-principle experiments affirmed these prospects, but further efforts are necessary to push this field beyond its current status. In this work, we show that temporal filtering of single-photon pulses enables a performance optimization of QKD systems implemented with realistic quantum light sources, both in experiment and simulations. To this end, we analyze the influence of temporal filtering of sub-Poissonian single-photon pulses on the expected secret key fraction, the quantum bit error ratio, and the tolerable channel losses. For this purpose, we developed a basic QKD testbed comprising a triggered solid-state single-photon source and a receiver module designed for four-state polarization coding via the BB84 protocol. Furthermore, we demonstrate real-time security monitoring by analyzing the photon statistics, in terms of g(2)(0), inside the quantum channel by correlating the photon flux recorded at the four ports of our receiver. Our findings are useful for the certification of QKD and can be applied and further extended for the optimization of various implementations of quantum communication based on sub-Poissonian quantum light sources, including measurement-device-independent schemes of QKD as well as quantum repeaters. Our work represents an important contribution towards the development of QKD-secured communication networks based on quantum light sources.
Issue Date: 24-Mar-2020
Date Available: 13-Jan-2021
DDC Class: 530 Physik
Subject(s): fibre optics
quantum optics
single photons and quantum effects
information technology
quantum information
optical communications
Sponsor/Funder: BMBF, 13N14876, Quantenkommunikations-Systeme auf Basis von Einzelphotonenquellen (QuSecure)
Journal Title: npj Quantum Information
Publisher: Springer Nature
Publisher Place: London
Volume: 6
Article Number: 29
Publisher DOI: 10.1038/s41534-020-0262-8
EISSN: 2056-6387
Appears in Collections:AG Optoelektronik und Quantenbauelemente » Publications

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