Who is making the engines for Boom Supersonic?

Could you please clarify who exactly is responsible for manufacturing the engines that power Boom Supersonic's aircraft? Are they collaborating with an established engine manufacturer, or have they developed their own proprietary engine technology? Additionally, what are the key factors that led Boom Supersonic to choose this particular company or technology for their engines, and how does it contribute to their overall goal of creating a faster and more efficient mode of air travel?