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DV-QKD coexistence with 1.6 Tbps classical channels over hollow core fibre

DV-QKD coexistence with 1.6 Tbps classical channels over hollow core 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. To find the best and worst wavelength position for the classical channels, we simulated different classical channels bands with different spacing between the quantum and classical channels considering the crosstalk generated from both Raman scattering and four-wave-mixing (FWM) on the quantum channel. Following our simulation, we numerically estimate the best (Raman spectrum dip) and worst locations (Raman spectrum peak) of the classical channel with respect to its impact on the performance on the quantum channel in terms of SKR and QBER. 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 50 GHz (0.4 nm) spacing between each classical channel. The SKR 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 SMF at − 24 dBm total coexistence power which is 250 times lower than the power used in HC-NANF. In the worst-case scenario using the same powers, and with 1 THz (8 nm) spacing between quantum and classical channels, the SKR dropped 10% using the HC-NANF, whereas in the SMF the SKR plummeted to zero.
Bandwidth variable transceivers, Hollow Core Nested Antiresonant Nodeless Fibre, Quantum Key Distribution, Quantum and Classical Channel Coexistence
0733-8724
5522-5529
Alia, Obada
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Tessinari, Rodrigo S.
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Bahrani, Sima
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Bradley, Thomas D.
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Sakr, Hesham
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Harrington, Kerrianne
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Hayes, John R.
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Chen, Yong
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Petropoulos, Periklis
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Richardson, David J.
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Poletti, Francesco
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Kanellos, George T.
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Nejabati, Reja
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Simeonidou, Dimitra
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Alia, Obada
316fbef1-4ad0-4716-9419-4c481b42fa3c
Tessinari, Rodrigo S.
97accfa6-a331-4859-abb4-077426fd96a0
Bahrani, Sima
28ed801d-c771-49de-b8d4-e8a4f3ef1147
Bradley, Thomas D.
14477285-3ac1-41c3-84a0-98ee480765f3
Sakr, Hesham
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Harrington, Kerrianne
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Hayes, John R.
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Chen, Yong
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Petropoulos, Periklis
522b02cc-9f3f-468e-bca5-e9f58cc9cad7
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Poletti, Francesco
9adcef99-5558-4644-96d7-ce24b5897491
Kanellos, George T.
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Nejabati, Reja
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Simeonidou, Dimitra
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Alia, Obada, Tessinari, Rodrigo S., Bahrani, Sima, Bradley, Thomas D., Sakr, Hesham, Harrington, Kerrianne, Hayes, John R., Chen, Yong, Petropoulos, Periklis, Richardson, David J., Poletti, Francesco, Kanellos, George T., Nejabati, Reja and Simeonidou, Dimitra (2022) DV-QKD coexistence with 1.6 Tbps classical channels over hollow core fibre. Journal of Lightwave Technology, 40 (16), 5522-5529. (doi:10.1109/JLT.2022.3180232).

Record type: Article

Abstract

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. To find the best and worst wavelength position for the classical channels, we simulated different classical channels bands with different spacing between the quantum and classical channels considering the crosstalk generated from both Raman scattering and four-wave-mixing (FWM) on the quantum channel. Following our simulation, we numerically estimate the best (Raman spectrum dip) and worst locations (Raman spectrum peak) of the classical channel with respect to its impact on the performance on the quantum channel in terms of SKR and QBER. 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 50 GHz (0.4 nm) spacing between each classical channel. The SKR 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 SMF at − 24 dBm total coexistence power which is 250 times lower than the power used in HC-NANF. In the worst-case scenario using the same powers, and with 1 THz (8 nm) spacing between quantum and classical channels, the SKR dropped 10% using the HC-NANF, whereas in the SMF the SKR plummeted to zero.

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2203.14621 - Accepted Manuscript
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Accepted/In Press date: 23 May 2022
e-pub ahead of print date: 3 June 2022
Published date: 15 August 2022
Additional Information: Publisher Copyright: © 1983-2012 IEEE.
Keywords: Bandwidth variable transceivers, Hollow Core Nested Antiresonant Nodeless Fibre, Quantum Key Distribution, Quantum and Classical Channel Coexistence

Identifiers

Local EPrints ID: 470628
URI: http://eprints.soton.ac.uk/id/eprint/470628
ISSN: 0733-8724
PURE UUID: 0c3de4bc-4726-48a3-beed-0685606e3d2e
ORCID for Hesham Sakr: ORCID iD orcid.org/0000-0002-4154-8414
ORCID for Yong Chen: ORCID iD orcid.org/0000-0003-0383-6113
ORCID for Periklis Petropoulos: ORCID iD orcid.org/0000-0002-1576-8034
ORCID for David J. Richardson: ORCID iD orcid.org/0000-0002-7751-1058
ORCID for Francesco Poletti: ORCID iD orcid.org/0000-0002-1000-3083

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Date deposited: 14 Oct 2022 17:06
Last modified: 09 Feb 2023 02:58

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Contributors

Author: Obada Alia
Author: Rodrigo S. Tessinari
Author: Sima Bahrani
Author: Thomas D. Bradley
Author: Hesham Sakr ORCID iD
Author: Kerrianne Harrington
Author: John R. Hayes
Author: Yong Chen ORCID iD
Author: George T. Kanellos
Author: Reja Nejabati
Author: Dimitra Simeonidou

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