of Quantum System Accelerator (QSA) Pioneers are researching the construction and co-design of the next generation of programmable quantum devices. An interdisciplinary team of scientists from the QSA Institute, Lawrence Berkeley National Laboratory (Berkeley Lab), and the University of California, Berkeley (UC Berkeley) is collaborating with Los Alamos National Laboratory to develop a new type of layered 2D We conducted a series of experiments using. Metals discover connections in electronic behavior that could potentially help in the fabrication of complex superconducting quantum processors. Research with this new transition metal dichalcogenide (TMD) leverages state-of-the-art national capabilities and equipment, while a team of Berkeley Lab experts collaborates and co-designs across a variety of disciplines. advanced light source and molecular foundry. Physical examination B The experimental results were announced in December 2022.
Exploring new superconducting 2D materials provides clues to many of the manufacturing and materials challenges for superconducting quantum processors, which currently use traditional materials such as aluminum, niobium, and silicon. TMD is an exotic metal that can be naturally processed into very thin layers with well-defined crystal structures that are ideal for experiments and devices. They exhibit unique physical properties due to the interaction of electrons. Electrons can be localized to a small number of atoms that interact more strongly with each other. Densely packed and closely interacting electrons can give rise to unique properties and behaviors, such as: superconducting and itinerant magnetism. Superconductivity allows electrical charges to move through metals with little or no resistance. Itinerant magnetism occurs when electrons move their magnetism from one atom to another, rather than being localized in a fixed location.
An important finding in the scientific literature is that the material is generally a superconductor or a magnet, but not both. However, the circulating magnetic phase is close to the superconducting transition. Therefore, detecting strong magnetic properties in the crystal structure of TMDs is an excellent starting point for the search for new superconductors. However, the extent to which cyclic magnetism and superconductivity interact in TMDs is not well understood.
NitaFourSe8 are an emerging class of intercalating TMDs with strongly correlated electrons moving in a two-dimensional plane with a ferromagnetic (nickel) layer, resulting in stronger interactions or correlations between the electrons. QSA researchers participating in a series of experiments characterized NiTa’s electronic conduction, or transport, properties.FourSe8we observe both circular magnetism and superconductivity.
“It’s really exciting that the laws of physics are often related to understanding symmetries, so we can understand things like the composition of different atoms and what their local and global environments are like. , we find that out when we study new materials with unique internal symmetries, said James, an associate professor at the University of California at Berkeley and a scientist at Berkeley Lab, who led the paper’s experiment. Analytis said:
To study the properties of superconductivity and itinerant magnetism, researchers needed to understand the internal symmetry of the material. Analytis and team synthesized various symmetrical configurations in NiTa.FourSe8, manipulate systems of atoms and electrons within layered crystalline metals through a variety of chemical treatments and techniques. A series of experiments allowed researchers to study how electrons behave within NiTa.FourSe8 By stacking, manipulating, and controlling them in the laboratory.
For materials science departments and molecular foundries Sinead GriffinOne of the paper’s co-authors and topic group research leader for the QSA document said the discovery of new superconductors is a top priority for the next generation of superconducting quantum technology. Griffin develops theoretical models and calculations that predict material properties to guide manufacturing and characterization in the laboratory.
“I’m motivated to discover new types of physics and systems that no one has seen before. That’s why I want to be close to the teams doing the experiments and measurements, but I’m also interested in Berkeley Lab’s facilities. “The opportunity to have a play area of equipment and equipment is important. We’re not limited by what’s available. We’re even more limited by our imaginations,” Griffin said.
The research team used angle-resolved photoelectron spectroscopy (ARPES), energy-dispersive X-ray spectroscopy (EDS or EDX), and powder X-ray diffraction to simulate, characterize, and study NiTa’s complex crystal structure.FourSe8 on the highest scale.
Eli Rotenberg, a staff scientist with ALS and QSA researchers, is fascinated by quantum materials with exotic physical properties derived from the interaction of electrons. Rothenberg, an expert in photoelectron spectroscopy, made extremely precise measurements of the behavior of electrons and the so-called Fermi surface, a key energy level in condensed matter physics for superconductivity.
“Crystals are like a glass of water, filled to a certain point and empty at the top where electrons near the surface participate in electrical conduction. The interesting physics of these crystalline materials is that the occupied It appears at the interface between a state and an unoccupied state. Particles can be excited from the occupied side to the unoccupied side to form a traveling wave that transfers energy information,” Rothenberg said. explained.
The complexity of novel materials being studied to build better quantum devices and the variety of measurements needed to understand them requires cutting-edge equipment and tools, each technique unique to the system. When incorporated into quantum devices, materials often change their properties or develop defects.
“The question of how do we find this new type of phenomenon that no one has discovered, or its consequences in systems and materials, is almost like asking the opposite question. Using theory, You can try to design materials from basic key ingredients,” Griffin said.
NitaFourSe8 It may not be the only magnetic TMD. The team therefore concludes that exploring correlated itinerant magnetism and unconventional superconductivity in 2D materials can further deepen our understanding of materials that can potentially be used in the fabrication of increasingly complex quantum processors. Ta. However, researchers need a deeper understanding of the fundamental level of this kind of his 2D materials. QSA continues to explore solutions to many manufacturing challenges that help bridge today’s imperfect hardware systems with those that enable impactful science.
“Having a single team with a single vision with all the tools available, like QSA, accelerates the process from basic science to technology. We need to consider whether the functionality is suitable for different materials,” concludes Analytis.
Founded in 1931 on the belief that the greatest scientific challenges are best met as a team, Lawrence Berkeley National Laboratory and its scientists have won 16 Nobel Prizes. Today, Berkeley Lab researchers are developing sustainable energy and environmental solutions, creating useful new materials, advancing the frontiers of computing, and exploring the mysteries of life, matter, and the universe. . Scientists from around the world use the institute’s facilities to make unique scientific discoveries. Berkeley Lab is a multiprogram national laboratory managed by the University of California for the U.S. Department of Energy’s Office of Science. The DOE Office of Science is the largest supporter of basic research in the physical sciences in the United States, working to address some of the most pressing challenges of our time. Learn more about. energy.gov/science.
Sandia National Laboratories is a multi-mission laboratory operated by National Technology and Engineering Solutions of Sandia LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration. With principal facilities in Albuquerque, New Mexico and Livermore, California, Sandia Laboratories has primary research and development responsibilities in nuclear deterrence, global security, defense, energy technology and economic competitiveness.
The Quantum Systems Accelerator (QSA) is one of five National Quantum Information Science Research Centers funded by the U.S. Department of Energy’s Office of Science. Led by Lawrence Berkeley National Laboratory (Berkeley Lab) and with Sandia National Laboratories as a lead partner, the QSA promotes national leadership in quantum information science and advances certified quantum advantages in scientific applications. co-design the algorithms, quantum devices, and engineering solutions needed to deliver . QSA brings together dozens of scientists who are pioneers in many of today’s unique quantum engineering and manufacturing capabilities. In addition to industry and academic partners around the world, 15 companies include Lawrence Berkeley National Laboratory, Sandia National Laboratories, University of Colorado Boulder, MIT Lincoln Laboratory, California Institute of Technology, Duke University, Harvard University, and Massachusetts Institute of Technology. of institutions participate in QSA. Tufts University, University of California, Berkeley, University of Maryland, University of New Mexico, University of Southern California, Utah State Austin, and the University of Sherbrooke in Canada. Learn more about. https://quantumsystemsaccelerator.org/