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Electrons use thermal quantum entanglement



Thermally entangled electrons

Color electron microscope image of the sample, the green layer is graphene, on top of the gray superconductor. Blue metal electrodes are used to extract entangled electrons.Credit: Aalto University

Quantum entanglement is the key to next-generation computing and communication technology. Aalto researchers can now use temperature differences to generate quantum entanglement.

A joint team of scientists from Finland, Russia, China and the United States proved that temperature differences can be used to entangle electron pairs in superconducting structures.Experimental findings, published in Nature CommunicationsIt is expected to have powerful applications in quantum devices, which makes us one step closer to the application of the second quantum revolution.

The research team led by Professor Pertti Hakonen of Aalto University showed that the thermoelectric effect provides a new way to generate entangled electrons in new devices. Quantum entanglement is the cornerstone of new quantum technology. However, this concept has plagued many physicists for many years, including Albert Einstein, who is very worried about the weird interactions that it will cause at greater distances,”

; said Professor Harkonen.

in Quantum computingEntanglement is used to fuse individual quantum systems into one, thereby multiplying their total computing power. Professor Gordey Lesovik of the Moscow Institute of Physics and Technology explained: “Entanglement can also be used in quantum cryptography to achieve the secure exchange of long-distance information.” Science. Considering the importance of entanglement to quantum technology, the ability to easily and controllably generate entanglement is an important goal for researchers.

Researchers designed a device to layer superconductors Graphene And metal electrodes. “Superconductivity is caused by entangled pairs of electrons called “Cooper pairs.” Using temperature differences, we split them, and then each electron moves to a different ordinary metal electrode.” PhD student Nikita Aalto University Kirsanov explained. “Despite being separated by a long distance, the resulting electrons are still entangled.”

In addition to practical significance, this work is of fundamental importance. Experiments show that the Cooper pair splitting process is a mechanism for converting temperature differences into related electrical signals in superconducting structures. The experimental program developed may also become a platform for the original quantum thermodynamic experiment.

Reference: “Thermal current in the graphene Cooper pair separator”, ZB Tan, A. Laitinen, NS Kirsanov, A. Galda, VM Vinokur, M. Haque, A. Savin, DS Golubev, GB Lesovik and PJ Hakonen, January 8, 2021, Nature Communications.
DOI: 10.1038 / s41467-020-20476-7

This work was performed using the OtaNano research infrastructure. OtaNano provides the most advanced working environment and equipment for Finnish nanoscience and technology and quantum technology research. OtaNano is operated by Aalto University and VTT and is available to academic and commercial users worldwide. To learn more, please visit their website. This work was funded by QTF (Finnish Board of Education). Gordey Lesovik’s guest professor funding came from the Faculty of Science of Aalto University, and Tan Zhenbing’s postdoctoral funding came from the Academy of Finland.




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