A superconducting nanowire single-photon camera with 400,000 pixels

Area of Science:

• Superconducting detector technology
• Photonics and optical sensing
• Quantum information science

Background:

• Superconducting detectors offer high sensitivity and speed for detecting faint electromagnetic signals.
• Existing superconducting nanowire single-photon detectors (SNSPDs) have excellent performance but are limited to kilopixel arrays.
• There is a need for large-format superconducting cameras for advanced scientific applications.

Purpose of the Study:

• To develop a large-scale superconducting camera with significantly more pixels than the current state-of-the-art.
• To demonstrate the feasibility of scaling SNSPD technology to hundreds of thousands of pixels.
• To enable new scientific investigations requiring high-resolution, high-efficiency photon detection.

Main Methods:

• Fabrication of a 400,000-pixel superconducting nanowire single-photon detector (SNSPD) array.
• Characterization of the camera's performance, including quantum efficiency, count rate, and dark-count rate.
• Design of an imaging area without ancillary circuitry for scalability.

Main Results:

• A 400,000-pixel SNSPD camera was successfully developed, a 400x improvement in pixel count.
• The camera achieved unity quantum efficiency at 370 nm and 635 nm.
• Demonstrated a high count rate (1.1 x 10^5 cps) and extremely low dark-count rate (1.0 x 10^-4 cps/detector).

Conclusions:

• The developed 400,000-pixel SNSPD camera represents a significant advancement in superconducting detector technology.
• The scalable architecture paves the way for future large-format superconducting cameras.
• This technology will enable new frontiers in fundamental science, quantum technologies, and imaging applications.