Is there a service of sorts to search for interesting tech startups by subject?

As of the title, I was wondering if there is any consistent way of searching for start-ups and other interesting emergent tech companies in different fields.
For example, I was interested in getting some quantum computing ones specifically for a long-term portfolio, a smaller part of my assets of course since we're a solid decade away from an explosion in the field. But I found no consistent way of getting information and any good data on the many companies.
Thanks for your attention, and sorry if there are any mistakes in the post, sinc english it's not my first language.