Photon number resolution enables quantum receiver for realistic coherent optical communications
Photon number resolution enables quantum receiver for realistic coherent optical communications
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DOI：
10.1038/nphoton.2014.280
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发表时间：
2015-01-01
期刊：
影响因子：
35
通讯作者：
Migdall, A.
中科院分区：
文献类型：
--
作者：
Becerra, F. E.;Fan, J.;Migdall, A.
量子增强测量可以提供有关物理系统属性的信息，其灵敏度超出了传统技术根本上可能实现的范围。 However, this advantage can be achieved only if quantum measurement technologies are robust against losses and real-world imperfections, and can operate in regimes compatible with existing systems.在这里，我们演示了一种用于相干通信的量子接收器，其性能不仅超过了标准量子极限，而且对于扩展到高平均光子数的输入功率也如此。该接收器使用自适应测量和光子数分辨率来实现高灵敏度和针对缺陷的鲁棒性，并最终显示出超越任何量子接收器在与最先进的光通信系统兼容的功率水平下所达到的标准量子极限的最大优势。 Our demonstration shows that quantum measurements can provide real and practical advantages over conventional technologies for optical communications.
Quantum-enhanced measurements can provide information about the properties of a physical system with sensitivities beyond what is fundamentally possible with conventional technologies. However, this advantage can be achieved only if quantum measurement technologies are robust against losses and real-world imperfections, and can operate in regimes compatible with existing systems. Here, we demonstrate a quantum receiver for coherent communication, the performance of which not only surpasses the standard quantum limit, but does so for input powers extending to high mean photon numbers. This receiver uses adaptive measurements and photon number resolution to achieve high sensitivity and robustness against imperfections, and ultimately shows the greatest advantage over the standard quantum limit ever achieved by any quantum receiver at power levels compatible with state-of-the-art optical communication systems. Our demonstration shows that quantum measurements can provide real and practical advantages over conventional technologies for optical communications.