6 Qubit processor control in silicon: ScienceAlert

Another record was broken on the way to full operation and capacity Quantum computersFull control of a 6 qubit processor made of silicon.

The researchers describe it as a “key stepping stone” for the technology.

Qubits (or quantum bits) are the quantum equivalents of classical computing bits, except that they can only process more information. Thanks to quantum physics, you can be in two states at once, rather than just 1 or 0.

The difficulty is getting so many qubits to behave the way we need them, which is why this jump to six is ​​so important. The ability to run it in silicon – the same material used in today’s electronic devices – makes the technology more viable.

“The Quantitative Statistics Today’s challenge consists of two parts,” Quantum computing researcher Stephen Phillips says: from Delft University of Technology in the Netherlands. “Develop qubits of good enough quality, and develop an architecture that allows one to build large systems of qubits.”

“Our work fits into both categories. Since the overall goal of building a quantum computer It’s a tremendous effort, and I think it’s fair to say we’ve made a contribution in the right direction.”

Qubits consist of individual electrons held in series, 90 nanometers apart (there are human hairs around them). Diameter 75000 nm). This line of “quantum dots” is placed in silicon, using a structure similar to the transistors used in standard processors.

Six qubit processor.
Six qubit processor. Qubits are created by adjusting the voltage on the red, blue, and green wires on the chip. SD1 and SD2 are highly sensitive electric field sensors that can detect the charge of a single electron. These sensors combined with advanced control systems allowed the researchers to place individual electrons at positions labeled 1-6, which were then actuated as qubits. (Phillips et al temper nature2022)

By making subtle improvements to the way the electrons were prepared, managed and monitored, the team was able to successfully control their spin – the quantum mechanical property that enables the qubit’s state.

The researchers were also able to create logic gates and two- or three-electron entanglement systems, on demand, with low error rates.

The researchers used microwave radiation, magnetic fields, and Electrical voltage To control the electron’s spin and read, run them as qubits, and have them interact with each other as required.

“In this paper, we push the qubit envelope in silicon, achieving high initialization accuracy, high readout accuracy, high single-qubit gate accuracy, and high 2-qubit state resolution,” Electrical engineer Levin Vandersiben says:also from Delft University of Technology.

“What really stands out is that we demonstrated all of these properties together in one experiment on a record number of bits.”

up to this point, 3 qubit processors only They are successfully built in silicon and controlled to the desired level of quality – so we’re talking about a huge step forward in terms of what’s possible in this type of qubit.

There are different ways to build qubits – Including on superconductorsMany qubits were played together — and scientists are still figuring out which way might be the best way forward.

The advantage of silicon is that the manufacturing and supply chains are already in place, which means that the transition from the scientific lab to the actual machine needs to be more straightforward. Work continues to push the qubit record higher.

“Through precision engineering, it is possible to increase the number of silicon spin qubits while maintaining the same precision for single qubits,” Electrical engineer Mateusz Madzik says: from Delft University of Technology.

“The main building block developed in this paper can be used to add more qubits in subsequent iterations of the study.”

The search was published in temper nature.

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