April 17th, the Japan Industrial Technology Research Institute recently reported that a research team of scientists participated in the world's first use of diamond light-emitting diodes to stably generate a single photon at room temperature, which will promote quantum cryptography communication and quantum computer related technology. .
The communique said that the senior engineer Yamazaki Satoshi and the associate professor of Osaka University, Sumiyuki Kazuo and other researchers used synthetic diamonds as raw materials, in which a complex composed of carbon atoms and nitrogen atoms was buried as a luminescent center, which was stably generated at room temperature. A single photon solves the energy and cost bottleneck that restricts the practical use of a single photon source.
Quantum cryptography is theoretically impossible to eavesdrop. It is an ideal communication technology. In recent years, many countries and enterprises in the world are studying. To achieve quantum cryptography communication, it is necessary to have a stable single photon source, which can easily and accurately emit photons carrying information when needed. So far, single photon sources mostly use quantum dots or organic molecules, but they are very unstable at room temperature, need to be cooled by extremely low temperature, and must be excited by laser, which increases energy consumption and cost.
In this study, researchers used high-quality synthetic diamonds without impurities as the luminescent layer (i-layer), embedded in the center of the luminescence, which consists of a hole that removes carbon atoms and a nitrogen atom. But diamonds without impurities can't conduct electricity. The researchers made a layer of phosphorus added N and a layer of boron added, sandwiching the i layer to form a component with a P-i-N structure.
By means of a precise method such as photon correlation spectroscopy, as long as current is passed through the luminescent layer of the element, the illuminating center can stably generate a single photon, confirming that the element can operate as a single photon source at room temperature. This opens the way for the development of energy-efficient, low-cost quantum cryptography. In addition, the illuminating center also has excellent spin performance and may be used as a component of a quantum computer.
The results of this research have been published in the latest online edition of Nature·Photonics.
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