Photon Spot

Photon Spot is a California-based company specializing in sub-Kelvin cryogenic systems and superconducting nanowire single-photon detectors (SNSPDs) for quantum technology applications. Founded in 2009 and headquartered in Monrovia, California, the company offers detectors with ultralow dark counts, precise timing resolution, and high quantum efficiency, combined with cryogenic systems operating at temperatures below 1 Kelvin. Photon Spot's products serve quantum communications, quantum computing, quantum sensing, and semiconductor diagnostics applications. The company's ultra-compact, ultra-low vibration cryogenic systems support time-resolved imaging applications benefiting integrated circuit manufacturers and quantum technology researchers. Primary customers include research institutions, national laboratories, and companies engaged in quantum-related research and development. Backed by investors including the National Science Foundation, Photon Spot represents American innovation in single-photon detection technology critical to photonic quantum computing, quantum key distribution, and quantum metrology applications.