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Scientists discover way to make quantum states last 10,000 times longer



UChicago Scientists Discover How to Make Quantum States Last 10,000 Times Longer

A team of scientists at Pritzker University School of Molecular Engineering at Pritzker University announced the discovery of a simple modification that allows quantum systems to stay functional – or “coherent” – 10,000 times longer than before. Credit: University of Chicago

If we can utilize it, quantum technology promises fantastic new possibilities. But first, scientists must coordinate quantum systems to stay awake for more than a few million seconds.

A team of scientists at Pritzker University School of Molecular Engineering at Pritzker University announced the discovery of a simple modification that allows quantum systems to stay functional – or “coherent” – 10,000 times longer than before. Although scientists tested their technique on a special class of quantum systems called solid-state qubits, they think it must be applicable to many other types of quantum systems and thus can revolutionize quantum, computing, and sensory communication. .

The study was published Aug. 13 in science.

“This breakthrough lays the foundation for exciting new research pathways in quantum science,” said lead author David Awschalom, professor of the Liew Family in Molecular Engineering, senior scientist at the Argonne National Laboratory and director of the Chicago Quantum Exchange. “The wide applicability of this discovery, coupled with a remarkably simple application, allows this strong coherence to affect many aspects of quantum engineering. This enables new research opportunities previously thought to be impractical.”

At the atomic level, the world operates according to the rules of quantum mechanics – very different from what we see around us in our daily lives. These various rules can translate into technology as virtually unstable networks or extremely powerful computers; The U.S. Department of Energy released a plan for the next quantum Internet at an event in UChicago on July 23rd. vibrations, temperature changes or electromagnetic fields lost.

Thus, scientists are trying to find ways to keep the system coherent for as long as possible. A common approach is to physically isolate the system from noisy surroundings, but this can be volatile and complex. Another technique involves making all the materials as clean as possible, which can be costly. Scientists in UChicago took on another difficulty.

“With this approach, we do not try to eliminate noise in the environment; on the contrary, we ‘trick’ the system into thinking it does not experience noise,” said postdoctoral researcher Kevin Miao, the first author of the paper.

UChicago Scientists Discover How to Make Quantum States Last 10,000 Times Longer

A team of scientists at Pritzker University School of Molecular Engineering at Pritzker University announced the discovery of a simple modification that allows quantum systems to stay functional – or “coherent” – 10,000 times longer than before. Credit: University of Chicago

Along with the usual electromagnetic pulses used to control quantum systems, the team applied a continuous alternating magnetic field. By accurately tuning this field, scientists could quickly rotate the electrons and allow the system to “tune” the rest of the noise.

“To get an understanding of the principle, it’s like sitting on a fun tour with people shouting all around you,” Miao explained. “When the ride is still on, you can hear them perfectly, but if you are spinning fast, the noise is blurred in a background.”

This small change allowed the system to stay coherent for up to 22 milliseconds, four orders of magnitude higher than without modification – and much longer than any previously reported electronic rotation system. (For comparison, an eye leak requires about 350 milliseconds). The system is able to almost completely regulate some forms of temperature fluctuations, physical vibrations and electromagnetic noise, all of which usually destroy quantum coherence.

Simple fixation can unlock discoveries in almost any field of quantum technology, scientists said.

“This approach creates a path to escalation,” Awschalom said. “It should make it practical to store quantum information in electron spinning. Extended storage times will allow more complex operations on quantum computers and allow quantum information transmitted by spin-based devices to travel longer distances over networks.” “.

Although their tests were conducted on a solid-state quantum system using silicon carbide, the scientists believe the technique should have similar effects on other types of quantum systems, such as the overestimation of quantum parts and quantum molecular systems. This level of dexterity is unusual for such engineering progress.

“There are a lot of candidates for quantum technology that were pushed aside because they could not maintain quantum coherence for long periods of time,” Miao said. “They can be re-evaluated now that we have this way to improve the coherence mass.

“The best part is, it’s incredibly easy to do,” he added. “The science behind it is complex, but the logistics of adding an alternating magnetic field is very straightforward.”


Scientists develop the first quantum algorithm to characterize noise across large systems


More information:
KC Miao et al, “Protecting Universal Coherence in a Solid State Dome,” science, 13 August 2020. DOI: 10.1126 / science.abc5186

Provided by agoikagos University



citation: Scientists discover way to make quantum states last 10,000 times longer (2020, August 13) Retrieved August 13, 2020 from https://phys.org/news/2020-08-s Scientists-quantum-states -longer.html

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