A Quantum Key Distribution Testbed using a Plug&Play Telecom-wavelength Single-Photon Source
Timm Gao, Lucas Rickert, Felix Urban, Jan Gro{\ss}e, Nicole Srocka,, Sven Rodt, Anna Musia{\l}, Kinga \.Zo{\l}nacz, Pawe{\l} Mergo, Kamil Dybka,, Wac{\l}aw Urba\'nczyk, Grzegorz S\k{e}k, Sven Burger, Stephan Reitzenstein,, and Tobias Heindel

TL;DR
This paper presents a compact, telecom-wavelength quantum dot single-photon source integrated into a QKD testbed, demonstrating secure key distribution with high key rates and low error ratios, advancing fiber-based quantum communication.
Contribution
First demonstration of a portable, plug&play quantum dot single-photon source operating at telecom wavelengths in a QKD setup, enabling practical quantum-secured communication.
Findings
Achieved a raw key rate of up to 4.72 kHz.
Demonstrated secure key rates and low quantum bit error ratios.
Predicted tolerable losses up to 23.19 dB.
Abstract
Deterministic solid-state quantum light sources are considered key building blocks for future communication networks. While several proof-of-principle experiments of quantum communication using such sources have been realized, most of them required large setups often involving liquid helium infrastructure or bulky closed-cycle cryotechnology. In this work, we report on the first quantum key distribution (QKD) testbed using a compact benchtop quantum dot single-photon source operating at telecom wavelengths. The plug\&play device emits single-photon pulses at O-band wavelengths (nm) and is based on a directly fiber-pigtailed deterministically-fabricated quantum dot device integrated into a compact Stirling cryocooler. The Stirling is housed in a 19-inch rack module including all accessories required for stand-alone operation. Implemented in a simple QKD testbed emulating the BB84…
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