..but doesn't the story say that at least one company is already fabricating these things
commercially? That doesn't sound much like a "working lab-prototype" to me...
A couple of friends of mine are doing the layout for an experimental processor. It's getting sent to the fab in a week or so, and we should have 20 or so of them back a month or so after that.
This doesn't mean that this chip will be showing up in Circuit City next quarter. It doesn't even mean that it will be showing up in anyone else's lab for months. And this is being done in VLSI with standard transistors.
The company is fabricating devices with this kind of cool logic, but there's a lot more that goes into a computer than just a processor, and to make a machine "safe" for customers to use seems tricky.
 In our lab, we managed to slow-roast a well-designed, well-supported, not-quite-experimental board. This particular board is evolved far enough that it didn't have any hand-rework on it, and consists of off-the-shelf parts. What we did to roast this board is the kind of thing that happens every day (multiple users opening and programming it simultaniously) in the real world, but that you might not think to guard against when you're just trying to make it work in the lab. A computer built out of RSFQ is a much bigger jump than some PCI card.
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