The U.S. Department of Commerce’s National Institute of Standards and Technology (NIST) is conducting market research to identify sources capable of providing a Quantum Network pluggable 4-channel superconducting nanowire single-photon detector system. The system must operate continuously 24/7, be rack-mountable and moveable, and meet specific technical specifications including >80% detection efficiency and remote operation via a command library. Delivery is required within one month after receipt of order, F.O.B Destination to Gaithersburg, MD. No installation or training is needed, and the system must be warranted for 12 months. This is a sources sought notice for information and planning purposes only, not a solicitation.