Di Battista Giorgio, Fong Kin Chung, Díez-Carlón Andrés, Watanabe Kenji, Taniguchi Takashi, Efetov Dmitri K
Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstrasse 4, München 80799, Germany.
Quantum Engineering and Computing Group, Raytheon BBN Technologies, Cambridge, MA 02138, USA.
Sci Adv. 2024 Sep 20;10(38):eadp3725. doi: 10.1126/sciadv.adp3725. Epub 2024 Sep 18.
The moiré superconductor magic-angle twisted bilayer graphene (MATBG) shows exceptional properties, with an electron (hole) ensemble of only ~10 carriers per square centimeter, which is five orders of magnitude lower than traditional superconductors (SCs). This results in an ultralow electronic heat capacity and a large kinetic inductance of this truly two-dimensional SC, providing record-breaking parameters for quantum sensing applications, specifically thermal sensing and single-photon detection. To fully exploit these unique superconducting properties for quantum sensing, here, we demonstrate a proof-of-principle experiment to detect single near-infrared photons by voltage biasing an MATBG device near its superconducting phase transition. We observe complete destruction of the SC state upon absorption of a single infrared photon even in a 16-square micrometer device, showcasing exceptional sensitivity. Our work offers insights into the MATBG-photon interaction and demonstrates pathways to use moiré superconductors as an exciting platform for revolutionary quantum devices and sensors.
莫尔超导体魔角扭曲双层石墨烯（MATBG）展现出非凡的特性，其电子（空穴）系综每平方厘米仅有约10个载流子，这比传统超导体（SC）低五个数量级。这导致了这种真正二维超导体的超低电子热容量和大的动电感，为量子传感应用提供了破纪录的参数，特别是热传感和单光子探测。为了充分利用这些独特的超导特性用于量子传感，在此，我们展示了一个原理验证实验，通过在MATBG器件的超导相变附近施加电压偏置来探测单个近红外光子。即使在一个16平方微米的器件中，我们也观察到吸收单个红外光子后超导态完全被破坏，展示出非凡的灵敏度。我们的工作为MATBG与光子的相互作用提供了见解，并展示了将莫尔超导体用作革命性量子器件和传感器的令人兴奋的平台的途径。
