Quantum computing takes a step forward with spin centers | UCR News

Quantum computing takes a step forward with spin centers | UCR News

Quantum computing, which uses the laws of quantum mechanics, can solve a wide range of pressing problems that are too complex for classical computers, from medicine to machine learning. Quantum simulators are devices made of interacting quantum units that can be programmed to simulate complex models of the physical world. Scientists can then learn about these models, and therefore the real world, by controlling the interactions and measuring the resulting behavior of the quantum simulators.

Inside The paper was published in Physical Review B A UC Riverside-led research team, selected as the journal’s editors’ suggestion, has proposed a chain of quantum magnetic objects called spin centers that can be simulated quantumly to demonstrate various magnetic phases of matter and transitions between these phases in the presence of an external magnetic field.

Shan-Wen Tsai (left) and Troy Losey. (UCR/Tsal lab)

“We are designing new devices that host spin centers and can be used to simulate and learn interesting physical phenomena that cannot be fully studied with classical computers,” he said. Shan Wen Tsaia professor physics and astronomy“Spin centers in solid-state materials are localized quantum objects with large, as yet untapped potential for the design of new quantum simulators,” said lead author Dr.

According to this Troy LoserAdvances in these devices could make it possible to investigate more efficient ways to store and transfer information, as well as develop the methods needed to create room-temperature quantum computers, said Tsai’s graduate student and lead author of the paper.

“We have many ideas about how to improve spin-center-based quantum simulators compared to this first proposed device,” he said. “Using these new ideas and considering more complex arrangements of spin centers could help create quantum simulators that are easy to build and run, yet can simulate new and meaningful physics.”

Below, Tsai and Losey answer a few questions about the research:

Q: What is a quantum simulator?

Tsai: This is a device that exploits the unusual behavior of quantum mechanics to simulate interesting physics that is too difficult for a regular computer to calculate. Unlike quantum computers, which work with qubits and universal gate operations, quantum simulators are designed to simulate/solve specific problems individually. By foregoing the universal programmability of quantum computers in favor of exploiting the wealth of different quantum interactions and geometric arrangements, quantum simulators can be easier to implement and provide new applications for quantum devices, which is important because quantum computers are not yet universally useful.

A spin center is a quantum magnetic object, approximately the size of an atom, that can be placed inside a crystal. It can store quantum information, communicate with other spin centers, and be controlled by lasers.

Q: What are some applications of this work?

Losey: We can build the proposed quantum simulator to simulate exotic magnetic phases of matter and the phase transitions between them. These phase transitions are of great interest because the behavior of very different systems becomes identical at these transitions, which means that there are fundamental physical phenomena that connect these different systems.

The techniques used to build this device could also be used for spin-center-based quantum computers, a leading candidate for the development of room-temperature quantum computers, whereas most quantum computers require extremely cold temperatures to operate. Furthermore, our device assumes that the spin centers are arranged in a straight line, but it is possible to arrange the spin centers in up to 3D arrangements. This could allow the study of spin-based information devices that are more efficient than the methods currently used by computers.

Because quantum simulators are easier to build and run than quantum computers, we can use quantum simulators to solve certain problems that regular computers are not currently capable of handling while we wait for quantum computers to become more refined. However, this does not mean that quantum simulators can be built without difficulty, as we are currently getting close to being good enough at manipulating spin centers, growing pure crystals, and operating at low temperatures to build the quantum simulator we propose.