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Co-propagation of Classical and Continuous-variable QKD Signals over a Turbulent Optical Channel with a Real-time QKD Receiver

João Frazão, Vincent van Vliet, Sjoerd van der Heide +5 more

We demonstrate classical and quantum signal co-propagation over a turbulent free-space channel with 3 Tbit/s throughput and record 2.7 Mbit/s secret-key rate. Our real-time GPU-based receiver assessed quantum signal integrity under different turbulence scenarios for the first time.

arXiv:2401.10581Jan 19, 20241 citation

Co-propagation of Classical and Continuous-variable QKD Signals over a Turbulent Optical Channel with a Real-time QKD Receiver

João Frazão, Vincent van Vliet, Sjoerd van der Heide +5 more

We demonstrate classical and quantum signal co-propagation over a turbulent free-space channel with 3 Tbit/s throughput and record 2.7 Mbit/s secret-key rate. Our real-time GPU-based receiver assessed quantum signal integrity under different turbulence scenarios for the first time.

Optical Fiber Communication ConferenceJan 1, 20241 citation

Approaching Gb/s Secret Key Rates in a Free-Space Optical CV-QKD System Affected by Atmospheric Turbulence

Zhen Qu, Ivan B. Djordjević

We experimentally demonstrate an eight-state modulated free-space optical CV-QKD link. By multiplexing orbital angular momentum modes, polarization states and wavelengths, a total secret key rate of > 580 Mbit/s can be achieved at mean channel transmittances in medium-turbulence regime.

European Conference on Optical CommunicationSep 1, 201711 citations

Noise characterization for co-propagation of classical and CV-QKD signals over fiber and free-space link

João Frazão, Vincent van Vliet, Kadir Gümüş +5 more

Real-time CV-QKD receiver achieves peak 2.9 Mbit/s secret-key-rates over 12.8 km of fiber, while co-propagating 15 classical channels, separated 1 nm from the quantum signal. Performance degrades at higher launch powers due to crosstalk.

arXiv:2406.06540Apr 25, 20240 citations

Noise characterization for co-propagation of classical and CV-QKD signals over fiber and free-space link

João Frazão, Vincent van Vliet, Kadir Gümüş +5 more

Real-time CV-QKD receiver achieves peak 2.9 Mbit/s secret-key-rates over 12.8 km of fiber, while co-propagating 15 classical channels, separated 1 nm from the quantum signal. Performance degrades at higher launch powers due to crosstalk.

Quantum 2.0 Conference and ExhibitionJan 1, 20241 citation

Increasing the secret key rate of satellite-to-ground entanglement-based QKD assisted by adaptive optics

Valentina Marulanda Acosta, Daniele Dequal, Matteo Schiavon +4 more

Future quantum networks will be composed of both terrestrial links for metropolitan and continent-scale connections and space-based links for global coverage and infrastructure resilience. However, the propagation of quantum signals through the atmosphere is severely impacted by the effects of turbulence. This is even more the case for entanglement-based quantum communication protocols requiring two free-space channels to be considered simultaneously. In this work, we assess the advantage of turbulence mitigation by adaptive optics, in particular during daytime link operation, so as to increase the coupling of the received signal into an optical fiber. We show in particular that this improves the performance of entanglement-based quantum key distribution by up to a few hundred bits per second when compared with the uncorrected scenarioFuture quantum networks will be composed of both terrestrial links for metropolitan and continent-scale connections and space-based links for global coverage and infrastructure resilience. However, the propagation of quantum signals through the atmosphere is severely impacted by the effects of turbulence. This is even more the case for entanglement-based quantum communication protocols requiring two free-space channels to be considered simultaneously. In this work, we assess the advantage of turbulence mitigation by adaptive optics, in particular during daytime link operation, so as to increase the coupling of the received signal into an optical fiber. We show in particular that this improves the performance of entanglement-based quantum key distribution by up to a few hundred bits per second when compared with the uncorrected scenario

arXiv:2411.09564Nov 14, 20240 citations

Real-time CV-QKD Reception Resilient to Urban Atmospheric Turbulence

Abstract

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Real-time CV-QKD Reception Resilient to Urban Atmospheric Turbulence

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