HIPERCOM

自20世纪60年代S以来，相干光学原则上被认为是在光通信中实现非常高的带宽和比特率的最佳工具。虽然80年代S发展光纤放大器减少了开发这项技术的需要，但量子信息科学的出现重新引发了人们对使用相干光学实现高速率量子通信系统的兴趣。本项目的重点是相干量子通信，将零差或外差检测可实现的固有高速率与使用量子力学的基本好处(如无条件安全性)相结合。与经典通信系统不同，光放大器不能在量子通信系统中用作中继器，因为它固有地受到量子噪声的限制。这个项目的主旨是探索不同的技术，旨在绕过这个问题，提高相干(也称为连续变量)量子通信系统的范围，特别强调当今最发达的实际应用平台，即连续变量量子密钥分配。为了实现这一目标，将采取不同的策略，从使用经典编码和其他后处理算法--这是短期内最直接适用的解决方案--到依赖于特定量子光学方案并最终使用量子编码的更复杂的长期技术。我们联盟的特点是结合了5个在相干(连续变量)量子信息科学领域有杰出记录的学术团体的力量，包括2个理论(Uneverite Libre de Bruxelle，约克大学)和3个实验(Institut d‘Optique Graduate School，Max Planck Institute for the Science of Light，巴黎理工学院)团体，以及1个产业合作伙伴(Sequrenet)，他们将自然地将研究导向信息社会的需求。我们预计，应用团队和基础团队--无论是理论团队还是实验团队--之间的这种协同作用将极具激励性和生产力，并将增强欧洲在信息技术方面的竞争力。

Coherent optics has been known since the 1960's to be, in principle, the best tool to achieve very high bandwidths and bit rates in optical communication. While the development of fiber optical amplifiers in the 1980's has reduced the need for developing such a technology, the advent of quantum information sciences has triggered a renewed interest in using coherent optics to realize high-rate quantum communication systems. The present project is focused on coherent quantum communication as a way to combine the intrinsically very high rates achievable by homodyne or heterodyne detection with the fundamental benefits of using quantum mechanics such as unconditional security.Unlike with classical communication systems, an optical amplifier cannot be used as a repeater in a quantum communication setup because it is inherently limited by quantum noise. The thrust of this project is to explore different techniques aiming at circumventing this problem and improving the range of coherent (also called continuous-variable) quantum communication systems, with a special emphasis on today's most developed platform towards practical applications, namely continuous-variable quantum key distribution. Different strategies will be followed in order to attain this goal, ranging from the use of classical coding and other post-processing algorithms, which is the most directly applicable solution in the short term, to more elaborate longer-term techniques relying on specific quantum optical schemes and ultimately on the use of quantum coding. In particular, the potential solutions offered by the heralded noiseless linear amplifier, or other non-Gaussian heralded operations, will be investigated in detail.The specificity of our consortium is to combine the strength of 5 academic groups having an outstanding track record in the area of coherent (continuous-variable) quantum information science, including 2 theory (Universite Libre de Bruxelles, University of York) and 3 experimental (Institut d'Optique Graduate School, Max Planck Institute for the Science of Light, Telecom Paris Tech) groups, together with 1 industrial partner (SeQureNet) who will naturally orient the research towards the needs of the information society. We envision that this synergy between applied and fundamental - both theoretical and experimental - teams will be highly stimulating and productive, and will reinforce European competitiveness in information technologies.