Title: Distribution of non-Gaussian states in a deployed telecommunication fiber channel Show Chinese title

Title: 非高斯态在部署的电信光纤信道中的分布

Abstract: Optical non-Gaussian states hold great promise as a pivotal resource for advanced optical quantum information processing and fault-tolerant long-distance quantum communication. Establishing their faithful transmission in a real-world communication channel, therefore, marks an important milestone. In this study, we experimentally demonstrate the distribution of such non-Gaussian states in a functioning telecommunication channel that connects separate buildings within the DTU campus premises. We send photon-subtracted squeezed states, exhibiting pronounced Wigner negativity, through 300 m of deployed optical fibers to a distant building. Using quantum homodyne tomography, we fully characterize the states upon arrival. Our results show the survival of the Wigner function negativity after transmission when correcting for detection losses, indicating that the established link can potentially facilitate the violation of Bell's inequality and enable quantum steering. This achievement not only validates the practical feasibility of distributing non-Gaussian states in real-world settings, but also provides an exciting impetus towards realizing fully coherent quantum networks for high-dimensional, continuous-variable quantum information processing. Show Chinese abstract

Abstract: 光学非高斯态作为先进光学量子信息处理和容错长距离量子通信的关键资源，具有巨大的潜力。因此，在现实通信信道中实现其忠实传输标志着一个重要里程碑。在本研究中，我们实验演示了这种非高斯态在连接DTU校园内不同建筑的功能性电信通道中的分发。我们将光子减去的压缩态通过部署的300米光纤传输到远处的建筑。使用量子同调层析成像，我们全面表征了到达的态。我们的结果表明，在纠正检测损耗后，威格纳函数的负性得以保留，这表明建立的链路可能有助于违反贝尔不等式并实现量子引导。这一成就不仅验证了在现实环境中分发非高斯态的实际可行性，还为实现高维连续变量量子信息处理的完全相干量子网络提供了令人兴奋的动力。