The latest theories about how our universe was/is created is called the String Theory. It is the String Theory that took it out of the realm of science fiction and into the laboratory. If I recall correctly, String Theory worked out that there should be eleven dimensions...which results in Alternate or Parallel realities.
Apparently we can switch realities like tuning in to frequencies,I don't believe Government"s would want us to know about parallel world's in the same way they hide UFO material, or anything that challenges the standard narrative, I'm thinking quantum technology is already communicating with other world's.