On February 20, 2024, Fujitsu announced that, in collaboration with QuTech, a quantum technology research institute in the Netherlands, it has succeeded in developing technology to operate electronic circuits that control qubits used in diamond spin quantum computers at extremely low temperatures.
The newly developed technology utilizes QuTech’s cryo-CMOS circuit technology and diamond spin qubit technology. By designing the magnetic field application circuit and microwave circuit required to drive the diamond spin qubit using cryo-CMOS circuit technology, we succeeded in implementing a diamond spin qubit in a 4K temperature environment.
In order for qubits to operate accurately, they must be lowered to extremely low temperatures of -268°C or below, but it has been difficult to control the electronic circuits that control quanta at extremely low temperatures. Wiring was complicated because the electronic circuit had to be installed outside the refrigerator.
Cryo-CMOS circuits are compatible with extremely low temperatures, so we designed magnetic field application circuits and microwave circuits by applying this. By installing these in the same refrigerator as the qubit and operating them, they were able to generate a magnetic field and microwave strong enough to drive a diamond spin qubit, successfully driving the qubit.
This technology simplifies wiring, making it possible to build high-performance, large-scale integrated quantum computers. In the future, it is expected that electronic circuits will be directly connected to qubit processors, allowing quantum computers to achieve both scalability and performance.
Source: Monoist
https://monoist.itmedia.co.jp/mn/articles/2403/07/news076.html
