Microwave quantum illumination using a digital receiver
Microwave quantum illumination using a digital receiver
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DOI：
10.1126/sciadv.abb0451
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发表时间：
2020-05-01
期刊：
影响因子：
13.6
通讯作者：
Fink, J. M.
中科院分区：
文献类型：
--
作者：
Barzanjeh, S.;Pirandola, S.;Fink, J. M.
量子照明利用纠缠的信号闲散光子对来提高高热噪声环境中低反射率物体的探测效率。它的优势在低信号功率下尤为明显，这对于非侵入性生物医学扫描或低功率短程雷达等应用来说是一个很有前途的特性。在这里，我们实验研究了微波频率下量子照明的概念。我们在自由空间探测装置中产生纠缠场来照亮距离1米的室温物体。我们实现了一种基于线性正交测量的数字相位共轭接收机，尽管存在干扰信号路径，但在相同条件下，该接收机的性能优于对称的经典噪声雷达。从实验数据出发，我们还模拟了完美空闲光子数检测的情况，与相对的经典基准相比，它具有量子优势。我们的研究结果突出了微波量子电路首次在室温下应用的机遇和挑战。
Quantum illumination uses entangled signal-idler photon pairs to boost the detection efficiency of low-reflectivity objects in environments with bright thermal noise. Its advantage is particularly evident at low signal powers, a promising feature for applications such as noninvasive biomedical scanning or low-power short-range radar. Here, we experimentally investigate the concept of quantum illumination at microwave frequencies. We generate entangled fields to illuminate a room-temperature object at a distance of 1 m in a free-space detection setup. We implement a digital phase-conjugate receiver based on linear quadrature measurements that outperforms a symmetric classical noise radar in the same conditions, despite the entanglement-breaking signal path. Starting from experimental data, we also simulate the case of perfect idler photon number detection, which results in a quantum advantage compared with the relative classical benchmark. Our results highlight the opportunities and challenges in the way toward a first room-temperature application of microwave quantum circuits.