Scientists have found a new way to control quantum information using a special material, chromium sulfide bromide.
It can store and process data in multiple forms, but its magnetic properties are the real game-changer. By adjusting its magnetization, researchers can confine excitons quantum particles that carry information allowing for longer-lasting quantum states and new ways to process data.
Quantum “Miracle Material” Enables Magnetic Switching
A newly identified quantum “miracle material” may enable magnetic switching, according to researchers from the University of Regensburg and the University of Michigan.
This discovery could lead to advancements in quantum computing, sensing, and other technologies. Previous studies found that quantum particles called excitons can sometimes be restricted to a single line within the material, chromium sulfide bromide. The new research provides both theoretical and experimental evidence linking this confinement to the material’s magnetic properties.
Chromium sulfide bromide is particularly exciting for quantum research because it can encode information in multiple ways: through electric charge, light (photons), magnetism (electron spins), and vibrations (phonons).
“The long-term vision is, you could potentially build quantum machines or devices that use these three or even all four of these properties: photons to transfer information, electrons to process information through their interactions, magnetism to store information, and phonons to modulate and transduce information to new frequencies,” said Mackillo Kira, U-M professor of electrical and computer engineering.
Harnessing Excitons for Quantum Encoding
One of the ways chromium sulfide bromide could encode quantum information is in excitons. An exciton forms when an electron is moved out of its “ground” energy state in the semiconductor into a higher energy state, leaving behind a “hole.” The electron and hole are paired together, and that collective state is an exciton.
The excitons are trapped in single layers by chromium sulfide bromide’s unusual magnetic properties. The material is made up of layers just a few atoms thick, like molecular phyllo pastry. At low temperatures under 132 Kelvin (-222 Fahrenheit), the layers are magnetized the spins of the electrons align with one another. The direction of the magnetic field switches to the opposite direction from one layer to the next. This is an antiferromagnetic structure.
Above 132 Kelvin, the material isn’t magnetized the heat keeps the electron spins from staying aligned, so they point in random directions. In the unmagnetized state, the excitons aren’t trapped but extend over multiple atomic layers, making them three-dimensional. They can also move in any direction.
Quantum Confinement and Longevity of Information
When the antiferromagnetic structure confines excitons to a single atomic layer, the excitons are further restricted to a single line a single dimension because they can easily move along only one of the two axes of the plane. In a quantum device, this confinement helps quantum information last longer because the excitons are less likely to collide with one another and lose the information they carry.
“The magnetic order is a new tuning knob for shaping excitons and their interactions. This could be a game changer for future electronics and information technology,” said Rupert Huber, professor of physics at the University of Regensburg in Germany.
Excitons’ Fine Structure: A Surprising Discovery
The experimental team, led by Huber, produced excitons inside a sample of chromium sulfide bromide by hitting it with pulses of infrared light just 20 quadrillionths of a second long. Then, they used another infrared laser with less energetic pulses to nudge the excitons into slightly higher energy states. In this way, they discovered that there are two variations of the excitons with surprisingly different energies—when normally, they would have identical energies. This splitting of an energy state is known as fine structure.
The team also explored how the material varies in space by shooting those less energetic pulses along two different axes within the material to probe the inner structures of excitons. This approach revealed the highly direction-dependent excitons, which could either be confined to a line or expanded in three dimensions. These configurations can be adjusted based on the magnetic states, switchable through external magnetic fields or temperature changes.
A New Pathway for Quantum Information Processing
“Since the electronic, photonic, and spin degrees of freedom are strongly intertwined, switching between a magnetized and a nonmagnetized state could serve as an extremely fast way to convert photon and spin-based quantum information,” said Matthias Florian, U-M research investigator in electrical and computer engineering and co-first author with Marlene Liebich, a Ph.D. candidate in physics at the University of Regensburg.
The theory team, led by Kira, explained these results with quantum many-body calculations. The calculations used the structure of the material to systematically predict the exceptionally large fine-structure splitting in the magnetically ordered material and the transitions between the two exciton states when the material transitioned in and out of magnetic order. They also confirmed that the transition from one-dimensional to three-dimensional excitons accounted for the substantial changes observed in how long excitons could go without colliding, as the larger and more mobile excitons have more opportunities to collide.
Website: International Conference on High Energy Physics and Computational Science.
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