Cryogenic control without the wiring nightmare

3:03:39over here we've got, as I said, on the bottom is our cubit chip with the 54 quantum dots that's connected via ribbon cable to this cryo controller. Here's what's actually happening. The cryo controller from room temperature, room temperature is on the is outside of the dilution refrigerator, right? I have a computer where I'm talking to all of the electronics that's going all the way down into this stuff. Now, I don't want my room temperature wires to go all the way down to millich Kelvin stage, >> right? >> That would be really bad. >> Mhm. >> Because again, on one end is room temperature 300 Kelvin and on the other end is something colder than outer

3:04:21space. >> It's going to be really hard to maintain that thing at colder than outer space. >> So instead, >> you've got this intermediary called the cryocontroller assembly. >> Yeah. where you feed the cryocontroller all of these communications, the digital communications, um the instructions on what to put the gate >> yeah yeah yeah >> biases to like what are the algorithms what are the circuits that I want to implement and furthermore you don't even have to furthermore you don't even have to give it instructions on exactly what the circuit needs to be the [snorts] cryocontroller itself is a chip >> that has memory and processing so you can give it a instruction instruction on

3:05:01implement this. It's got some like memory and processing to be able to know what signal signals to then send through the ribbon cable to our daughterboard. It's it's it acts like an air traffic controller to some extent which has people in it. It's not just like routing without intuiting it on its own. Like it has the ability to route but also be like ah that doesn't make sense like you know you can >> there's there's some headlines that say that it's autonomously controlled. This is kind of what they mean by that is like is like the cryocontroller is given some instructions but then it's making its own >> decisions based on the the context. >> Yeah. >> Okay. I like that. >> Okay. And I like that >> because there because the cryocontroller is this like middleman. Yeah.

3:05:42>> You can isolate the room temperature electronics to go to that and then this thing when feed when it feeds it through the ribbon cable that is superconducting the amount of thermal leakage is at a minimum. >> Yeah, that makes sense. So we're basically splitting out the we're splitting the journey that the instruction goes to get to its destination. We're decoupling the thermal impact from the delivery of the information. >> Exactly. One of the reasons why this is important is if we go back to our discussion about superconducting cubits. >> Yeah. >> All of those microwave lines had to go all the way down to the chip. >> Yep. >> There wasn't a middleman. >> Yep. >> It had to go all the way down to the chip. And if it goes all the way down to the chip, you're heating up the most

3:06:23delicate part, the part that is the coldest. You don't have a lot of power to cool the part that's the coldest. It's much easier to cool something that's 4 Kelvin than it is to cool something that's at tens of millichelvin. >> Y'all got too many wires, man. I don't know what to tell you. >> So, even though there is a wiring problem, >> it's kind of okay, right? >> At least for this many, right? Yeah, >> there's there's arguments to be made about okay, like let's if we get to a millions of cubits, the ribbon cable isn't really going to work, and we can get into that later. Okay. >> Right. So, it's it's an MVP for a reason. >> Okay. I I see path, but I understand. >> Yeah. Um, so now that's all fine, but it's not going to amount to anything if you don't get all of the problems that

3:07:04we talked about down. >> Yeah. With the >> the valleys, the charge noise. >> Yeah. >> The magnetic noise, >> all of that stuff. I mean, you're scaling, but if your cubits are not good, >> yeah, >> if the cubits are trash, if the gates are trash, if there's so much noise, you're not going to get anywhere. >> Yeah. You can't actually do that. >> So, the fidelity has to go up. The gates, like when when I say flip this thing, it better be flipping this thing 99.9% of the time. >> Okay. Now, if a gate has an fidelity of