A nanoantenna for ultra-secure quantum communication over long distances.

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A nanoantenna for ultra-secure quantum communication over long distances.

Osaka University researchers have enhanced the transfer efficiency between quantum information carriers in a way that is based on well-known nanoscience and compatible with impending advanced communication technologies.

The storing and transfer of information using simple ones and zeros, as in today’s conventional computer technology, is insufficient for quantum technologies in development. Researchers in Japan have now created a nanoantenna that will aid in the actual implementation of quantum information networks.

Researchers from Osaka University and collaborators recently published a study in Applied Physics Express that shows how a metal nanostructure can significantly improve photon-to-electron conversion, which is a significant step forward in the development of advanced data sharing and processing technologies.

Simple onoff readouts are used in traditional computer information. It’s simple to amplify and retransmit this data across large distances using a repeater technique. Quantum information is dependent on readouts such photon polarization and electron spin, which are comparably more sophisticated and secure. Quantum dots are semiconductor nanoboxes that researchers have proposed for storing and transmitting quantum information. Quantum repeater technologies, on the other hand, have several drawbacks. For example, present methods for converting photon-based information to electron-based information are inefficient. The researchers at Osaka University set out to solve this problem of information conversion and transfer.

“In gallium arsenide quantum dots—common materials in quantum communication research—the efficiency of converting single photons into single electrons is now too low,” says main author Rio Fukai. “As a result, we created a nanoantenna made up of ultra-small concentric rings of gold that focused light onto a single quantum dot, yielding a voltage reading from our device.” When compared to not employing the nanoantenna, the researchers increased photon absorption by a factor of up to 9. The majority of photogenerated electrons were not confined in a single quantum dot after illumination, but instead collected in impurities or other parts of the device. Nonetheless, the surplus electrons produced a limited voltage readout that could be separated from that produced by the quantum dot electrons, so the device’s intended readout was not disrupted.

According to senior author Akira Oiwa, “theoretical calculations imply that we can boost photon absorption by up to a factor of 25.” “In our group, we’re working on improving the alignment of the light source and more precisely constructing the nanoantenna.” These findings have significant implications. Researchers now have a way to boost the prospects of impending quantum communication and information networks by utilizing well-established nano-photonics. Summary of Brinkwire News

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