Private communication with quantum cascade laser photonic chaos

Olivier Spitz (), Andreas Herdt, Jiagui Wu, Grégory Maisons, Mathieu Carras, Chee-Wei Wong, Wolfgang Elsäßer and Frédéric Grillot
Additional contact information
Olivier Spitz: LTCI, Télécom Paris, Institut Polytechnique de Paris
Andreas Herdt: Technische Universität Darmstadt
Jiagui Wu: Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California Los Angeles
Grégory Maisons: mirSense, Centre d’intégration NanoInnov
Mathieu Carras: mirSense, Centre d’intégration NanoInnov
Chee-Wei Wong: Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California Los Angeles
Wolfgang Elsäßer: Technische Universität Darmstadt
Frédéric Grillot: LTCI, Télécom Paris, Institut Polytechnique de Paris

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Mid-infrared free-space optical communication has a large potential for high speed communication due to its immunity to electromagnetic interference. However, data security against eavesdroppers is among the obstacles for private free-space communication. Here, we show that two uni-directionally coupled quantum cascade lasers operating in the chaotic regime and the synchronization between them allow for the extraction of the information that has been camouflaged in the chaotic emission. This building block represents a key tool to implement a high degree of privacy directly on the physical layer. We realize a proof-of-concept communication at a wavelength of 5.7 μm with a message encryption at a bit rate of 0.5 Mbit/s. Our demonstration of private free-space communication between a transmitter and receiver opens strategies for physical encryption and decryption of a digital message.

Date: 2021
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DOI: 10.1038/s41467-021-23527-9

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