Toward Fully-Fledged Quantum and Classical Communication Over Deployed Fiber with Up-Conversion Module

Year: 2021

Authors: Bacco D.; Vagniluca I.; Cozzolino D.; Friis S.M.M.; Hogstedt L.; Giudice A.; Calonico D.; Cataliotti F.S.; Rottwitt K.; Zavatta A.

Autors Affiliation: Tech Univ Denmark, Dept Photon Engn, Ctr Silicon Photon Opt Commun SPOC, DK-2800 Lyngby, Denmark; Univ Naples Federico II, Dept Phys Ettore Pancini, I-80126 Naples, Italy; CNR, Ist Nazl Ott CNR INO, I-50125 Florence, Italy; NLIR ApS, Hirsemarken 1,1st Floor, DK-3520 Farum, Denmark; Micro Photon Devices Srl, Via Antonio Stradivari 4, I-39100 Bolzano, Italy; INRiM Ist Nazl Ric Metrol, I-10135 Turin, Italy; Univ Firenze, LENS, Via G Sansone, I-50019 Sesto Fiorentino, Italy; Univ Firenze, Dipartimento Fis & Astron, Via G Sansone, I-50019 Sesto Fiorentino, Italy; QTI SRL, I-50125 Florence, Italy.

Abstract: Quantum key distribution (QKD), the distribution of quantum secured keys useful for data encryption, is expected to have a crucial impact in the next decades. However, despite the notable achievements accomplished in the last 20 years, many practical and serious challenges are limiting the full deployment of this novel quantum technology in the current telecommunication infrastructures. In particular, the co-propagation of quantum signals and high-speed data traffic within the same optical fiber is not completely resolved, due to the intrinsic noise caused by the high-intensity of the classical signals. As a consequence, current co-propagation schemes limit the amount of classical optical power in order to reduce the overall link noise. However, this ad-hoc solution restrains the range of possibilities for a large scale QKD deployment. Here, a new method, based on up-conversion assisted receiver, for co-propagating classical light and QKD signals is proposed and demonstrated. In addition, its performances are compared with an off-the-shelf quantum receiver, equipped with a standard single-photon detector, over different lengths of an installed fiber link. The authors? proposal exhibits higher tolerance for noise in comparison to the standard receiver, thus enabling the distribution of secret keys in the condition of 4 dB-higher classical power.

Journal/Review: ADVANCED QUANTUM TECHNOLOGIES

Volume: 4 (7)      Pages from: 2000156-1  to: 2000156-8

More Information: This work was supported by the Center of Excellence SPOC – Silicon Photonics for Optical Communications (ref DNRF123), by the EraNET Cofund Initiatives QuantERA within the European Union´s Horizon 2020 research and innovation program grant agreement No.731473 (project SQUARE) and by the NATO Science for Peace and Security program under Grant No. G5485.
KeyWords: frequency up-conversion; quantum communication; wavelength multiplexing
DOI: 10.1002/qute.202000156

Citations: 2
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