We have a highly respected Theoretical Physicist and a pioneer of Quantum Computing, along with the Founder of one of the leading quantum computer companies, D-Wave (whose clients include Google and NASA), talking about parallel universes. Here is a key that I discovered. They are not talking about parallel universes as a theory but as something factual that exists.

An amazing article on the ability of a Quantum Computer to exploit parallel universes. This article is a MUST READ!