The future of computing is quantum — or so headlines would have you believe. They’re not incorrect. Yet like the flying car, quantum computing is a technology that’s as elusive as it is enchanting. A computer that can go beyond the simple, binary 0s and 1s of today’s ‘classical’ designs opens a new world of possibility, but the technical hurdles are massive, and no one knows how long it’ll take to overcome them.
That’s not discouraging researchers, however. Quantum computers have reached an important milestone in recent years and piqued the interest of massive companies. Companies you’ve heard of. Companies like Intel, which has shipped Core processors in hundreds of millions of computers across the globe.
An old dog learning some new tricks
Intel may seem an unlikely choice for innovation in quantum computing. Sure, it’s known for its powerful PC processors, but the company’s expertise is concentrated in classic computers built for the x86 instruction set. Intel’s 8086 chip, the first x86 processor, is nearing its 40th birthday. The fundamental underpinnings of Intel’s modern chips harken back to that now-ancient predecessor.
Jim Clarke, Intel’s Director of Quantum Hardware, explained to Digital Trends that the company will continue to lean on past expertise to drive future research, and quantum computing is no exception. During a visit to Intel’s campus, Clarke pulled out a slick, rainbow-like wafer. It looked a lot like those you’ve seen in the news or Intel’s own ads, but this one was different.
“What you see here is a wafer that comes from our 300-millimeter technology line just a few miles down the Ronler Acres campus,” Clarke told us. “We’re doing this wafer with the same technology that we’re using for our advanced chips. And what you see here are basically small spin qubit arrays.”
That’s the company’s quantum computing effort in a nutshell. It wants to advance the technology, just as does Google and IBM, as well as many universities. But Intel has a different approach. It wants to do it with silicon.
“We’re essentially using the same process lines, same tools, same design rules to do this, and that’s an advantage for Intel.”
“There are a total of, I think, roughly 50000 qubits on this wafer,” Clarke explained. “They’re not coupled together so we can’t use them together. But you see the power of using Intel’s advanced process lines. If we can get this technology working we’re going to be making chips that are the same from wafer to wafer, and we’re going to have lots and lots of qubit arrays on any given wafer.”
What Clarke’s talking about is not just production. He’s talking about mass production.
It’s easy to see why Intel would approach the technology with mass production in mind. It’s the only company among its competitors that makes a bulk of its money directly from processor sales. It’s a self-serving goal, to be sure, but one that gives Intel a unique incentive.
There’s many reasons why Google might want to build quantum computer, but selling quantum chips isn’t high on the list. IBM does sell chips, but only to enterprise customers. Intel’s the only horse in the race that might, one day, seek to sell you a quantum computer.
It’s not a crazy idea. As Clarke made clear, “this is running in the same fab that’s doing the cutting edge Core chips. […] With, I’ll say, some different challenges with making the wafers, we’re essentially using the same process lines, same tools, same design rules to do this, and that’s an advantage for Intel.”
Check my qubits, bro
Alright. Intel is interested in building quantum computers with its traditional, mass-production methods, but does that really mean you’ll have a sweet quantum computer under your desk?
The big challenge facing quantum computing is the fragility of qubits. Due to the funky nature of quantum mechanics, it’s incredibly easy to disrupt a qubit’s coherence, which makes the whole thing go wrong. Clarke told us even a bit of heat can do it.
“So, what we do is we operate these systems at very cold temperatures,” he said. “We have these refrigerators called dilution refrigerators that are about the size of a 55-gallon drum. And they can get down to a fraction of a degree above absolute zero. In fact, we would say they are 250 times colder than deep space.” Hardcore PC overclockers might salivate over such a cooler, but don’t get too excited. An Intel Core i7 wouldn’t work at such low temperatures. It’d likely crack or shatter.
“I’ll leave miniaturization for the next generation, but right now I actually don’t think it’s a problem to have a large system.”
These incredible cooling requirements put obvious limitations on how modern quantum processors operate. You can’t just stick a current quantum rig in a home office. Hell, you can’t even stick one in most labs. It’s a highly specialized field that currently requires highly specialized equipment. Miniaturization will help, to be sure, but the massive apparatuses that are used today won’t fit into a desktop tower overnight. Or perhaps even over the next decade.
Yet not everything about a quantum computer is strange. The device still needs short-term memory, long term-storage, and circuit boards that connect various components together. This additional hardware “just is not at the same part of the refrigerator as that as the quantum chip,” Clarke told us. “In fact, a large quantum chip could very well have a small supercomputer next to it, controlling the information into and out of the actual chip.”
In theory, then, a quantum computer might someday end up looking like today’s desktops, though Clarke certainly wasn’t ready to commit to the idea. He reminded us that today’s computers began life as room-sized devices that accepted input only by punch cards and executed instructions on transistors that were (at least) the size of your thumb. That was over 70 years ago, and it’s really only over the last 20 years that PCs slimmed down to the backpackable size we’re used to today.
“If we think about the first Cray supercomputers in the mid-70s they were probably as large as half this room, and these were the most powerful computers on earth at that time. No one would have thought that close to 40 years later we would have miniaturized these, and more, into our back pockets,” Clarke said. “I’ll leave that miniaturization for the next generation, but right now I actually don’t think it’s a problem to have a large system. If that system is the world’s most powerful computer.”
Freaking out about security
The arrival of quantum computing isn’t universally anticipated with eager acceptance, however. Many modern encryption algorithms, like RSA keys, offer protection, because forcing the algorithm would take billions of years for even the most powerful classical computers. Quantum computing, though, is a different story.
“With RSA keys, we take a number that is the product of two large prime numbers, and you can only access the message or the code or the credit card number if you have both of those prime numbers,” Clarke told us. “That’s actually a very hard calculation to do with a classical computer. […] A quantum computer, because it can access such a large space, could conceivably factor these RSA keys in a very very short time, let’s say a minute.”
That’s unsettling to anyone with an eye for security. The NSA began taking steps to harden security against quantum computing in 2015. To make matters worse, Intel has found itself swamped by a swarm of security vulnerabilities in its chips. Processors were once commonly assumed a relative safe-haven. Many even have “secure enclaves” built-in to offer an additional layer of security against hackers looking to hijack the chip.
Now, that clean reputation has been soiled. Both security experts and consumers are beginning to cast a more skeptical eye on hardware. Does that mean a digital doomsday is approaching? Clarke doesn’t think so.
“Within that the types of algorithms and the requirements for a quantum computer that could do cryptography are actually pretty severe, so we’re probably several years beyond that 10-year timeline to have something that would work for cryptography.”
Ten years is a long time for researchers to prepare for quantum computing’s arrival, and encryption techniques impervious to quantum already exist today.
“An example of a technology that would be quantum resistant would be something like the one-time pads used in World War II or by Cold War spies,” Clarke said.
A one-time pad isn’t a magic pill. Figuring out how to easily share it digitally in a timely manner with minimal overhead won’t be easy – but Intel has researchers working on that problem. Clarke seemed hopeful that new encryption methods will be available before quantum computing becomes common enough to threaten modern encryption.
The next generation
It’s still early days in the development of quantum hardware, but the interest of companies like Google, IBM, and Intel are a clear step forward. Clarke thinks that the company’s experience will give Intel the edge in the race. “We are betting that with Intel’s expertise with the Intel architecture, that sort of expertise at the person level, we can bring those people to Quantum and make headway,” said Clarke.
You’ll have to wait to see the results of the company’s efforts, of course. Clarke spoke of time horizons that covered decades, not years or months. Even the development of top-tier classical processors is a long, tiring business that evades easy solution. It’ll be a long time before you see the Intel Inside label slapped on a quantum chip, but it now feels as likely to happen as not.
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