Yokohama National University is located there.
The field of quantum computing has the potential to perform tasks too complex for traditional computers and to do so at high speeds, making it the new frontier for science and engineering. Development of large-scale quantum processors and quantum memories is necessary to get to the point where quantum computers can meet their expected performance potential. Control of qubits, the basic building blocks of quantum computers, is important, but methods of controlling them have limitations.
Researchers from Yokohama National University in Japan have found a way to control qubits. Their results were published in a scientific journal.
"Microwaves are usually used for individual quantum control, but individual wiring of microwave lines is required," said Hideo Kosaka, director of the Quantum Information Research Center in the Institute of Advanced Sciences. It is possible to manipulate qubits locally but not precisely.
Kosaka and the other researchers were able to demonstrate control of qubits by manipulating the electron spin through a combination of microwave manipulation and local optical shifting. They were able to combine optical methods using light from lasers with microwaves to overcome previous limitations
The control of electron spin could be used to control the nuclear spin of the nitrogen atom. This is important because it allows precise control of qubits.
Kosaka said that the simultaneous irradiation of light and microwaves enabled individual and precise control of qubits. It paved the way for large-scale quantum processors and quantum memories which are essential for the development of large-scale quantum computers.
The researchers were able to create a state in which particles exist in the same state even if they are physically separated. This will allow for interqubit communication with the photon and will require less computing power and allow the transfer of information to quantumprocessors and quantum memories.
The new method is compatible with all of the criteria needed for a quantum computer to work. It can be applied to other magnetic field schemes to individually manipulate qubits, and it can also be used to guard against common types of computing errors such as gate errors or environmental noise.
The number of variables that can be controlled using this method is the reason for the improved fidelity of our scheme.
The researchers say that this advancement is a step towards quantum computing.
Large-scale integrated diamond quantum computers, quantum storages, and quantum sensors can be realized. It will improve the data transmission capacity of the quantum internet.
Yuhei Sekiguchi of the Institute of Advanced Sciences at Yokohama National University was one of the authors.
More information: Hideo Kosaka, Optically addressable universal holonomic quantum gates on diamond spins, Nature Photonics (2022). DOI: 10.1038/s41566-022-01038-3. www.nature.com/articles/s41566-022-01038-3 Journal information: Nature Photonics Provided by Yokohama National University
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