Probing free-space quantum channels with laboratory-based experiments
Probing free-space quantum channels with laboratory-based experiments
复制标题
DOI：
10.1103/physreva.95.063801
复制
发表时间：
2017-02
影响因子：
2.9
通讯作者：
M. Bohmann;R. Kruse;J. Sperling;C. Silberhorn;W. Vogel
中科院分区：
文献类型：
--
作者：
M. Bohmann;R. Kruse;J. Sperling;C. Silberhorn;W. Vogel
大气信道是在全球范围内建立安全量子通信的有希望的候选者。然而，由于其湍流性质，了解大气对光量子特性的影响并通过实验对其进行检查至关重要。在本文中，我们介绍了一种在实验室规模上利用量子光探测大气自由空间联系的方法。与以前的工作相比，我们的方法对湍流引起的任意强度损失进行建模，以模拟一般的大气条件。这使我们能够以良好控制的方式表征湍流量子通道。为了实现该技术，我们使用不同的恒定衰减进行一系列测量，并通过组合获得的数据来模拟波动损耗。我们使用片上非经典光源和时间仓复用检测系统直接测试所提出的方法。利用获得的数据，我们表征了不同大气噪声模型生成状态的非经典性，并分析了后选择协议。这种大气量子光学中的通用技术可以研究湍流量子通道并预测其未来应用的特性。
Atmospheric channels are a promising candidate to establish secure quantum communication on a global scale. However, due to their turbulent nature, it is crucial to understand the impact of the atmosphere on the quantum properties of light and examine it experimentally. In this paper, we introduce a method to probe atmospheric free-space links with quantum light on a laboratory scale. In contrast to previous works, our method models arbitrary intensity losses caused by turbulence to emulate general atmospheric conditions. This allows us to characterize turbulent quantum channels in a well-controlled manner. To implement this technique, we perform a series of measurements with different constant attenuations and simulate the fluctuating losses by combining the obtained data. We directly test the proposed method with an on-chip source of nonclassical light and a time-bin-multiplexed detection system. With the obtained data, we characterize the nonclassicality of the generated states for different atmospheric noise models and analyze a post-selection protocol. This general technique in atmospheric quantum optics allows for studying turbulent quantum channels and predicting their properties for future applications.