Feasibility of quantum key distribution through a dense wavelength division multiplexing network

By Bing Qi, Wen-sen Zhu, Li Qian, Hoi-Kwong Lo. 2010

158 citations recorded by the source corpus.

In this paper, we study the feasibility of conducting quantum key distribution (QKD) together with classical communication through the same optical fiber by employing dense-wavelength-division-multiplexing (DWDM) technology at telecom wavelength. The impact of classical channels on the quantum channel has been investigated for both QKD based on single-photon detection and QKD based on homodyne detection. Our studies show that the latter can tolerate a much higher level of contamination from classical channels than the former. This is because the local oscillator used in the homodyne detector acts as a ‘mode selector’, which can suppress noise photons effectively. We have performed simulations based on both the decoy BB84 QKD protocol and the Gaussian-modulated coherent state (GMCS) QKD protocol. While the former cannot tolerate even one classical channel (with a power of 0 dBm), the latter can be multiplexed with 38 classical channels (0 dBm power per channel) and still has a secure distance around 10 km. A preliminary experiment has been conducted based on a 100 MHz bandwidth homodyne detector.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/7b94724250d7c7761bb378da04436766e9a36d4e

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Distributing Secret Keys with Quantum Continuous Variables: Principle, Security and Implementations (2015, background): “Furthermore, an important practical issue concerns the ability of QKD systems to be integrated into classical network infrastructures by means of wavelength division multiplexing techniques; here, again, CVQKD is a good candidate to achieve this goal, as has been shown recently [97,98].”
Secure quantum key distribution (2014, background): “On the other hand, it turns out that CV-QKD systems can also be quite robust against noise from strong telecom traﬃcs due to multiplexing [70, 71].”
Advances in quantum cryptography (2019, unknown): “[318] B.”