/Use magnets to suppress noise in quantum information (via Qpute.com)
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Use magnets to suppress noise in quantum information (via Qpute.com)


Argonne researchers have demonstrated on-chip quantum circuits to achieve strong coupling between superconducting resonators and magnetic devices. This early study introduced a new platform for investigating quantum information processing. Credits: Ellen Weiss / Argonne National Laboratory.

The US Department of Energy (DOE) recently funded both the Argonne National Laboratory at DOE and the University of Illinois at Champaign Urbana (UIUC) on a new project related to quantum information science. The Argonne team brings expertise in the coupling of superconducting and magnetic systems to the project. The UIUC team will contribute to world-class capabilities for developing new magnetic materials for quantum systems.

“Quantum information science promises a variety of new ways scientists can process and manipulate information for sensing, data transfer, and computing,” said Valentine Novosad, senior scientist in Argonne’s Department of Materials Science. Says. “UIUC is the perfect partner for making breakthrough discoveries in this area.”

In emerging fields Quantum information scienceDue to its physical properties, microwaves can play a fundamental role because they can provide the desired quantum function at temperatures close to absolute zero (minus 460 degrees Fahrenheit). This is necessary because heat causes errors in quantum operations. However, microwaves are sensitive to noise, which is unnecessary energy that interferes with the transmission of signals and data.

The research team will investigate whether Magnon can partner microwave oven A photon that allows microwaves to move in only one direction. This essentially eliminates noise. Magnon is the basic excitation of a magnet. In contrast, microwave photons result from electronic excitations that produce microwave-like waves.

Argonne scientists build on previous efforts to create superconducting circuits that are integrated with magnetic elements. Magnons and photons communicate with each other through this superconducting device. Superconductivity (no electrical resistance at all) allows magnons and microwave photons to be coupled near absolute zero.

“This feature provides a unique opportunity to manipulate quantum information,” explained YiLi, a postdoctoral fellow in the materials science department at Argonne.

In the past, Argonne has played a major role in the development of superconducting detectors and sensors to understand how the universe works at the most basic level. “We will benefit from the valuable knowledge gained from these highly successful projects in cosmology and particle physics,” Novosad said.

UIUC researchers are looking for magnets that work at cryogenic temperatures. They test known new material systems to handle ultra-cold environments and find candidates that can work with real-world quantum devices.

“Many magnets work well with microwaves at room temperature,” said Axel Hoffmann, founder professor and leader of engineering at UIUC. business.. “We need materials that work well at much lower temperatures. It may completely change their properties.”

“If successful within the last three years, the magnetic structure will be directly integrated with the quantum circuit,” Hoffman said. “This work can also be applied to non-quantum devices for sensing and communication, such as Wi-Fi and Bluetooth technologies.”

This new project is another example of how Argonne and UIUC are leading the way to the future of quantum. Argonne not only conducts interdisciplinary research within a large portfolio of QIS projects, but also leads Q-NEXT, one of the five QIS research center DOEs established in August 2020. Similarly, UIUC supports a wide range of quantum information projects such as Q-. Next, through the Illinois Quantum Information Science and Technology (IQUIST) Center.


Scientists combine magnetization with superconductivity for quantum discovery


Quote: Suppressing noise in quantum information using magnets (September 3, 2021) From September 3, 2021 https://phys.org/news/2021-09-magnets-clamp-noise-quantum.html Get

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