Ultra-fast single-photon detectors with high current density and operating temperature can benefit space and ground applications, including quantum optical communication systems, lightweight cryogenics for space crafts, and medical use. Despite decades of dedicated research, progress in superconducting devices utilizing high critical temperature (Tc) materials has remained relatively modest. This is due to several factors, including the challenges associated with high-Tc material synthesis and device fabrication, the complexity of their underlying physics, and the thermal management difficulties inherent in higher-temperature operation. However, recent advancements in MgB₂ thin-film growing [1] and defect engineering [2] have opened new possibilities for developing MgB₂-based detectors and electronics, paving the way for enhanced performance and broader applications.
In my talk, I will overview the current state of MgB₂-based detectors and electronics, highlighting key challenges and emerging applications in high-energy physics and neuromorphic science. I will also present our recent studies on thin films and nanostructures, revealing new observations that offer valuable insights into the underlying mechanisms of MgB₂-based devices.

[1] S. Cherednichenko and et al, Superconductor Science and Technology 34.4 (2021): 044001.
[2] Ilya Charaev and et al, Nature Communications 15.1 (2024): 3973.