huh

This isn't really a homework help question I just don't know where to put this. I googled https://www.scientificamerican.com/article/physicists-create-biggest-ever-schroedingers-cat/ . I tried reading the article and some of the terminology is confusing. I have a layman's understanding of semi conductors. I also have a layman's understanding of Schrodinger cat. It is just the rest of the article that confuses me. The reason the article states that the object becomes quantum is because " the Sapphire oscillate and coupled it to a superconducting circuit"? This line is what is confusing me. Can someone explain that line and any other parts of the article if needed? And why does the quoted line turns the Sapphire quantum?