Superconducting nanowire photon-number-resolving detector at telecommunication wavelengths
Superconducting nanowire photon-number-resolving detector at telecommunication wavelengths
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DOI：
10.1038/nphoton.2008.51
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发表时间：
2008-05-01
期刊：
影响因子：
35
通讯作者：
Fiore, Andrea
中科院分区：
文献类型：
--
作者：
Divochiy, Aleksander;Marsili, Francesco;Fiore, Andrea
光学转换是光学检测器操作的基础，可以是线性的或非线性的。当需要高灵敏度时，使用单光子检测器，以强烈的非线性模式运行，它们的响应与检测到的光子数量无关。然而，需要光子数分辨的检测器，尤其是在常规生产N-光子状态的量子光学元件中。在量子通信和量子信息处理中，光子数溶解功能是许多协议的关键，例如实现量子中继器（1）和线性 - 光学量子计算（2）。具有单光子灵敏度的线性检测器也可以用于测量极低光级别的时间波形，例如在长距离光学通信，荧光光谱和光学时域反射测定法中。我们在这里证明了基于平行超导纳米线的光子数分辨率检测器，并且能够在电信波长下计数多达四个光子，并具有超大的深度计数速率和高计数频率。
Optical-to-electrical conversion, which is the basis of the operation of optical detectors, can be linear or nonlinear. When high sensitivities are needed, single-photon detectors are used, which operate in a strongly nonlinear mode, their response being independent of the number of detected photons. However, photon-number-resolving detectors are needed, particularly in quantum optics, where n-photon states are routinely produced. In quantum communication and quantum information processing, the photon-numberre-solving functionality is key to many protocols, such as the implementation of quantum repeaters(1) and linear- optics quantum computing(2). A linear detector with single-photon sensitivity can also be used for measuring a temporal waveform at extremely low light levels, such as in long-distance optical communications, fluorescence spectroscopy and optical time-domain reflectometry. We demonstrate here a photon-number-resolving detector based on parallel superconducting nanowires and capable of counting up to four photons at telecommunication wavelengths, with an ultralow dark count rate and high counting frequency.