Intel Corp.’s two primary research organizations, Intel Labs and Components Research, announced today that they’re making big progress as they work towards large-scale production of quantum computing processors.
At the 2022 Silicon Quantum Electronics Workshop in Orford, Quebec, Intel’s researchers said that they’ve been able to demonstrate the highest reported yield and uniformity rate when manufacturing “silicon spin qubit devices” at the company’s transistor research and development facility. The research is believed to be a key milestone for Intel as it moves towards being able to fabricate quantum computing chips on its existing transistor manufacturing processes.
Intel is a key player in the race to build quantum computers, which are more advanced machines that encode data as “qubits”, as opposed to the conventional bits used in traditional computers. The advantage of qubits is they’re not restricted to states of 1 or 0, as they can also exist as both states at the same time – a characteristic that’s known as superposition. This is all due to the quirks of quantum physics. Intel likens qubits to a coin that could be heads, tails or spinning non-stop. While the coin is spinning, it can be considered as heads and tails at the same time.
As Intel explains further, if a spinning coin is able to represent two states at once, then two spinning coins can represent four states – HH, TT, HT, TH. From there, the possibilities expand rapidly, with three spinning coins able to represent eight states. What’s important to understand is that the qubit’s ability to represent multiple states makes them vastly more powerful than traditional bits. As such, the more qubits there are in a quantum computer, the more capable the machine will be.
What’s surprising is that, as magical as these qubits might seem, they’re actually manufactured in the same way as traditional computer chips. They’re produced on silicon wafers as “spin qubits” with the biggest difference being that they’re much more fragile. They can only exist at incredibly low temperatures to maintain their stability.
Until now, most research processes have focused on creating one quantum chip at a time. This is what Intel has done differently, instead using existing extreme ultraviolet lithography techniques to create a typical 300 millimeter wafer packed with multiple quantum chips. According to Intel, its prototypes demonstrate the strongest uniformity thus far, with a yield rate of around 95%.
Intel Director of Quantum Hardware James Clarke said the research shows that the idea of fabricating quantum chips on the company’s existing transistor process nodes is a “sound strategy” that will deliver results as the technology matures.
Because Intel has achieved higher yield and uniformity versus earlier chips, it can now use statistical process control techniques to identify areas of the fabrication process that can be optimized. In this way, it can accelerate its research efforts and hopefully scale to one day mass produce thousands or even millions of qubits for commercial quantum computers.
“In the future, we will continue to improve the quality of these devices and develop larger scale systems, with these steps serving as building blocks to help us advance quickly,” Clarke said.
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