This is a notice of a proposed sole-source contract action, not a request for competitive bids or quotations. The government intends to award a contract to Oz Optics Limited in Ottawa, Canada, for the procurement of one specific Bright Polarization-Entangled Photon Source system. The award is planned on or before April 30, 2026. While the government believes Oz Optics is the only responsible source capable of meeting the strict technical requirements, other responsible sources may submit capability statements for consideration.