Osaka University develops nano antenna for long-distance and ultra safe quantum communication

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835dc7b99d11587 - Osaka University develops nano antenna for long-distance and ultra safe quantum communication

for the quantum technology under development, the coding form of information storage and transmission based on “0” and “1” adopted by today’s classical computers is obviously far from enough

Osaka University has joined hands with partner researchers to significantly enhance the efficiency of photoelectric conversion through metal nanostructures – which is also an important step in developing advanced technology for sharing / processing data and making it closer to the needs of practical applications

it is reported that classical computer information is based on simple “on / off” readings, so it is relatively simple to realize long-distance information transmission through relevant relay amplification technology. However, quantum information is based on relatively more complex and secure quantum physical properties, such as photon polarization and electron spin. Therefore, semiconductor nano boxes called quantum dots have become the quantum information storage / transmission components that many researchers focus on. However, quantum relay technology has some limitations, especially the conversion of photoelectric information is very inefficient. To overcome this challenge of information transformation and transmission, researchers at Osaka University focus on solving the problem

Osaka University develops nano antenna for long-distance and ultra safe quantum communication

> explained that the efficiency of converting a single photon into a single electron on GaAs quantum dot materials commonly used in quantum communication research is still very low

to this end, the research team of the university has designed a new nano antenna – which is composed of ultra-small gold concentric rings – which can focus light on a single quantum dot, so that relay devices can easily read voltage

compared with the non nano antenna scheme, the researchers have improved the photon absorption efficiency by 9 times. After illuminating a single quantum dot, most of the photogenerated electrons are not trapped, but accumulate in impurities or other locations in the device. Even so, these extra electrons give a minimum voltage reading, which makes it easy to distinguish it from the voltage reading generated by quantum dots without damaging the expected reading of the device

senior author Akira Oiwa added: theoretical simulation shows that the subsequent technology is expected to improve the photon absorption efficiency to 25 times. At present, the research team is planning to start from two aspects: one is to improve the light source alignment, and the other is to manufacture nano antennas more accurately

looking forward to the future, the new technology is expected to promote the development of quantum communication information network on the basis of mature nano photonics. With the help of abstract physical properties such as entanglement / superposition, quantum technology may bring unprecedented information security and data processing applications in decades