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arXiv · 1911.01652

IR- and visible- light single photon detection in superconducting $MgB_{2}$ nanowires

Sergey Cherednichenko·Narendra Acharya·Evgenii Novoselov·Vladimir Drakinskiy
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Abstract

State-of-the-art Superconducting Nanowire Single Photon Detectors based on low-Tc materials reach 100% quantum efficiency. However, the response time is limited to >1-10 ns. Recently, it has been shown that due to a much lower kinetic inductance, a 100 ps response rate can be achieved in 120 $μ$m-long $MgB_{2}$ nanowires. In this work, we demonstrate experimentally that such $MgB_{2}$ nanowires function as single-photon detectors for both visible ($λ$= 630 nm) and infrared ($λ$= 1550 nm) photons when biased close to the critical current, with a dark count rate of <10 cps. $MgB_{2}$ photodetectors over-perform NbN SNSPDs in speed by at least an order of magnitude for similar nanowire lengths. Such photodetectors offer a platform for single-photon detectors with a long thought-after combination of a large detector area and a response rate of up to 10 GHz with a single readout line.

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Sergey Cherednichenko, Narendra Acharya, Evgenii Novoselov, Vladimir Drakinskiy. 2020-10-08. IR- and visible- light single photon detection in superconducting $MgB_{2}$ nanowires. https://arxiv.org/abs/1911.01652

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