The National Institute of Standards and Technology (NIST) is conducting market research to identify vendors capable of supplying an Optical Access Dilution Refrigerator, with no solicitation currently available. This sources sought notice is not a request for quotes, and the government will not pay for any information provided. Responses must indicate the country of manufacture and include a capability statement limited to four pages. The applicable NAICS code is 334516, with a small business size standard of 1,000 employees. No budget, performance location, or submission timelines are specified in this notice.