Why is this the "holy grail"? Seems that room temperature quantum chips are not nearly as much of a big deal as, say, room temperature superconductors. You could keep a quantum chip in a special environment since they don't have to move around or span large areas.
Have you seen the machinery needed to cool down IBM's tiny qubit chip at the bottom? [1] It would be nice if you could just stick these things into your PC over PCIe some day. [1] https://c1.staticflickr.com/5/4403/23518086798_3d3af8313e.jp...
That’s not even half that equipment needed to reach cryogenic temperatures. What you linked appears to be the experimental setup that will get placed in some sort of cold chamber.
On an unrelated note: room temperature quantum chips would likely be more energy efficient as the coolers that go that cold aren’t particularly efficient.
Source: I used to work for a cryogenics companies.