Another quantum computer pic January 22, 2007
Posted by Geordie in D-Wave Science & Technology, General, Superconducting Electronics, Superconducting Processors, World Domination.trackback
Here’s a view of a 16-qubit processor mounted in its sample holder.
Hello,
A friend of mine sent me a link to this picture today. Given my background in electrical engineering, I remarked that it was odd that the semiconductor die was left bare rather than housed in a package. At first, I thought it might have something to do with high pin counts, but there’s only 144 header pins exposed. My second guess was that this structure is more amenable to supercooling (controlled heat flow across the substrates), but I can’t be certain that’s the reason, either.
So, why is the die directly wirebonded to a ceramic (?) substrate with exposed header pins? Why not simply encase the die in a CQFP package?
R. Singh: And why would someone go for a trouble of encasing a SINGLE die in a package (especially since off-the-shelf CQFP packages are likely to contain magnetic materials, like Ni underlayer, a big no-no for this kind of — SUPERconductor — circuit)?
Good thermal anchoring is a good reason, and the yellow color on the pic is not ceramic, it’s gold…
mechanical engineering design
Hi. Very nice blog. I\’ve been reading your other entries all day long..lol.
[...] do for us? – Beautiful pictures of superconducting quantum computer electronics (here, here and here – highly recommended) (Of particular interest to me): – Gate capacitance coupling of carbon [...]