Entanglement distribution over 150 km in wavelength division multiplexed channels for quantum cryptography

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• 作者：Djeylan Aktas ; Bruno Fedrici ; Florian Kaiser ; Tommaso Lunghi ; Laurent Labonté ; and Sé ; bastien Tanzilli
• 刊名：Laser & Photonics Reviews
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：10
• 期：3
• 页码：451-457
• 全文大小：666K
• ISSN：1863-8899

文摘

Granting information privacy is of crucial importance in our society, notably in fiber communication networks. Quantum cryptography provides a unique means to establish, at remote locations, identical strings of genuine random bits, with a level of secrecy unattainable using classical resources. However, several constraints, such as non-optimized photon number statistics and resources, detectors' noise, and optical losses, currently limit the performances in terms of both achievable secret key rates and distances. Here, these issues are addressed using an approach that combines both fundamental and off-the-shelves technological resources. High-quality bipartite photonic entanglement is distributed over a 150 km fiber link, exploiting a wavelength demultiplexing strategy implemented at the end-user locations. It is shown how coincidence rates scale linearly with the number of employed telecommunication channels, with values outperforming previous realizations by almost one order of magnitude. Thanks to its potential of scalability and compliance with device-independent strategies, this system is ready for real quantum applications, notably entanglement-based quantum cryptography.