Quantum Opus offers a compact (3U-rack sized) superconducting nanowire system which offers high detection efficiency, low-noise performance which is easy to use, even for researchers with no cryogenics experience. We offer standard products optimized for maximum detection efficiency near 950 nm or 1550 nm, but frequently build detectors to our customer’s specifications: optimized for specified wavelengths, broadband response, and even mid-infrared detection. We offer superconducting photon counting solutions to meet the needs of quantum optics, quantum computation, photon-starved optical communication, low-flux biophotonics, and fluorescence measurements.