Coexistence of Classical and Quantum Optical Channels with Core Antiresonant Nodeless Fibre
DV-QKD Coexistence With 1.6 Tbps Classical Channels Over Hollow Core Fibre
The feasibility of coexisting a quantum channel with carrier-grade classical optical channels over hollow core nested antiresonant nodeless fibre (hc-nanf) is experimentally explored for the first time in terms of achievable quantum bit error rate (qber), secret key rate (skr) as well as classical signal bit error rates (ber).
A coexistence transmission of 1.6 tbps is achieved for the classical channels simultaneously with a quantum channel over a 2 km-long hc-nanf with a total coexistence power of 0 dbm.
The secret key rate was preserved without any noticeable changes when coexisting the quantum channel with eight classical channels at 0 dbm total coexistence power in hc-nanf compared to a significant drop of 73% when using single mode fibre at -24 dbm total coexistence power which is 250 times lower than the power used in hc-nanf.
We further implemented a testbed to experimentally test both single mode fibre(smf) and hc-nanf in the best and worst-case scenarios.
In the best-case scenario, the spacing between quantum and classical is 200 ghz (1.6 nm) with 50ghz (0.4 nm) spacing between each classical channel.
Obada Alia, Rodrigo S Tessinari, Sima Bahrani, Thomas D Bradley, Hesham Sakr, Kerrianne Harrington, John Hayes, Yong Chen, Periklis Petropoulos, David Richardson, Francesco Poletti, George T Kanellos, Reja Nejabati, Dimitra Simeonidou