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Electrothermal feedback in superconducting nanowire single-photon detectors

机译:超导纳米线单光子探测器中的电热反馈

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摘要

We investigate the role of electrothermal feedback in the operation of superconducting nanowire single-photon detectors (SNSPDs). It is found that the desired mode of operation for SNSPDs is only achieved if this feedback is unstable, which happens naturally through the slow electrical response associated with their relatively large kinetic inductance. If this response is sped up in an effort to increase the device count rate, the electrothermal feedback becomes stable and results in an effect known as latching, where the device is locked in a resistive state and can no longer detect photons. We present a set of experiments which elucidate this effect and a simple model which quantitatively explains the results.
机译:我们研究电热反馈在超导纳米线单光子探测器(SNSPDs)的操作中的作用。已经发现,仅当该反馈是不稳定的时,才实现SNSPD的期望操作模式,这通过与它们相对较大的动感相关的缓慢的电响应自然发生。如果加快此响应以提高设备计数率,则电热反馈将变得稳定,并产生一种称为闩锁的效果,其中设备被锁定在电阻状态,无法再检测到光子。我们提供了一组实验来阐明这种效果,并提供了一个简单的模型来定量解释结果。

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