The new symmetric parity-time system opens up a wide range of waves to researchers, engineers

quantum physics

Available: Pixabay / CC0 Public Domain

Research from the labs of Lan Yang, the Edwin H. & Florence G. Skinner Professor, and Xuan “Silvia” Zhang, associate professor, at the McKelvey School of Engineering at Washington University in St. Louis. Petersburg. Louis, developed the first parity-time wireless system.

And it can be done without the use of exotic materials, requiring only the standard microelectronic technology used today for conventional connection circuits.

The research was published on March 17 in the journal Nature Nanotechnology.

PT-symmetric systems can change the flow of energy in surprisingly new ways. Now, they can operate in a very limited range – in the low -frequency acoustic domain or the high -frequency optical domain.

This new technology has fulfilled a concept with amazing mathematical properties from quantum physics in an integrated circuit. It opens up a whole new segment of the spectrum for research in the giga- and terahertz range.

“Our work is opening up this middle part (of the spectrum) that covers critical microwave and millimeter wave applications; we’re filling the gap,” Zhang said.

“No one in the world can build PT-symmetric systems that cover this frequency line.”

The key to these systems is to be able to accurately balance the energy loss of a resonator with the gain of a combined resonator. This special point of equilibrium is PT symmetry, which allows new and powerful ways to change the flow and localization of energy.

The image reflected in the mirror is a parity change – in reflection, the right hand is rotated and becomes a left hand, and so on. A video that is played backwards is an example of time reversal – events in the video move backwards in time.

Examples of different types of symmetry. Available: Murch laboratory

If two changes are made at the same time and “end with each other” – the system is the same as before the change – then that system is called PT symmetry.

That concept was used in combined photonic resonator systems to develop new technologies to control the flow of light, such as transmitting nonreciprocal light.

The ability to use a new swath of the electromagnetic spectrum opens up new information and technologies, said Weidong Cao, a postdoctoral research fellow at Zhang’s lab.

Typically, these types of systems are an integral part of radar, communications and power transmission systems. Nowadays, suitable components need large magnetic cores. “But now we can lower them to a round knot that’s attached as big as a finger,” Zhang said.

Thanks to new technology, the system can be scaled up, making it easier to use new technologies in existing technologies.

“Our integrated circuit design and circuit design allow you to build precisely for different parts of the electromagnetic spectrum,” says Cao.

“Our results show that the integration of PT symmetry into the integrated circuit technology can benefit a wide range of chip -related applications such as frequency switching and manipulation. of microwave advertising. “

Yang said he was excited that physics could be widely applied and quickly adapted to technology.

“It’s exciting to show the high level of workmanship and work that has resulted in a new design led by basic science in a platform that is widely used in the industry,” he said.

On-chip frequency converters in the gigahertz range can be used in quantum computers and future systems.

More information:
Weidong Cao et al, Full integration of parity – time -symmetric electronics, Nature Nanotechnology (2022). DOI: 10.1038 / s41565-021-01038-4

Presented by Washington University at St. Louis

Directions: New symmetric parity-time system opens up a wide range of waves to researchers, engineers (2022, April 5) Retrieved 6 April 2022 from -04-parity-time-symmetric-range-wavelengths .html

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