Coexistence of quantum key distribution and optical transport network based on standard single-mode fiber at high launch power

2021 ◽  
Author(s):  
Jiaqi Geng ◽  
Guanjie Fanyuan ◽  
Shuang Wang ◽  
Qifa Zhang ◽  
Yingying Hu ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Single Mode ◽  
Key Distribution ◽  
Single Mode Fiber ◽  
Transport Network ◽  
Optical Transport Network ◽  
Optical Transport

scholarly journals Quantum key distribution with entangled photons generated on demand by a quantum dot

2021 ◽  
Vol 7 (12) ◽  
pp. eabe6379
Author(s):  
Francesco Basso Basset ◽  
Mauro Valeri ◽  
Emanuele Roccia ◽  
Valerio Muredda ◽  
Davide Poderini ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Key Distribution ◽  
Real Life ◽  
Single Mode ◽  
Key Distribution ◽  
Single Mode Fiber ◽  
Entangled Photons ◽  
Secret Key ◽  
Quantum Networks ◽  
On Demand

Quantum key distribution—exchanging a random secret key relying on a quantum mechanical resource—is the core feature of secure quantum networks. Entanglement-based protocols offer additional layers of security and scale favorably with quantum repeaters, but the stringent requirements set on the photon source have made their use situational so far. Semiconductor-based quantum emitters are a promising solution in this scenario, ensuring on-demand generation of near-unity-fidelity entangled photons with record-low multiphoton emission, the latter feature countering some of the best eavesdropping attacks. Here, we use a coherently driven quantum dot to experimentally demonstrate a modified Ekert quantum key distribution protocol with two quantum channel approaches: both a 250-m-long single-mode fiber and in free space, connecting two buildings within the campus of Sapienza University in Rome. Our field study highlights that quantum-dot entangled photon sources are ready to go beyond laboratory experiments, thus opening the way to real-life quantum communication.

End-to-End Redundancy and Maintenance Condition Design for Nationwide Optical Transport Network

2018 ◽  
Vol E101.B (11) ◽  
pp. 2267-2276 ◽  
Author(s):  
Yoshihiko UEMATSU ◽  
Shohei KAMAMURA ◽  
Hiroshi YAMAMOTO ◽  
Aki FUKUDA ◽  
Rie HAYASHI
Keyword(s):  
Transport Network ◽  
Optical Transport Network ◽  
End To End ◽  
Optical Transport
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