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Researchers have successfully demonstrated the simultaneous operation of Continuous-Variable and Discrete-Variable Quantum Key Distribution systems on a shared optical channel using wavelength-division multiplexing. This breakthrough enables secure data transmission across hybrid fibre and free-space links without performance degradation, effectively overcoming previous channel loss limitations that hindered combined protocols. The achievement represents a significant step toward scalable, practical quantum communication networks by allowing distinct quantum methods to coexist on existing infrastructure.

Sources coveringQuantum Zeitgeist, Phys.org, Quantum Computing Report, LessWrong

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Researchers Combine Two Quantum Keys across Fibre and Open Air

Quantum ZeitgeistAugust 24, 20264 min read

Multiplexing distinct methods of secure data transmission onto the same fibre optic cable was previously unattainable without compromising performance. Now, simultaneous operation of Continuous-Variable (CV-) and Discrete-Variable (DV-) Quantum Key Distribution systems has been demonstrated delivering approximately 1. 43 Mbit/s at 7.

A key rate of approximately 1.43 megabits per second was achieved through the first simultaneous operation of Continuous-Variable and Discrete-Variable Quantum Key Distribution systems on a shared optical channel. The joint operation utilised wavelength-division multiplexing with colleagues at Sorbonne University and Paris Saclay University in France. Data transmission succeeded across both seventy kilometers of optical fibre and a six hundred and twenty metre daylight free-space link without detectable performance reduction. Two distinct methods of secure communication, Continuous Variable Quantum Key…

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