Fabrication of quantum LED with two dimensional materials"

Photograph: MeteAtat re

One of the challenges in the science and engineering of quantum computing, which can be used to perform complex calculations, is to create a device capable of controlling the generation of single photons in a quantum network. One of the methods to generate these single photons is to use a precise set of optical elements to form a composite multi laser device. Recently, the quantum emitters made of layered materials have shown potential for development. But even these layered materials need a light source to trigger a single photon emission.

Researchers at the University of Cambridge in the "natural" communication (NatureCommunications) issued a document that, as the semiconductor optical activity, two Se and two tungsten tungsten sulfide can be used for making quantum generator.

The transition metal chalcogenide thin layer provides a two-dimensional tight confined region of an electron filled hole. When an electron moves into a hole at a lower energy level, a photon can be generated at a difference. In the quantum LED made by British researchers, the voltage pushes the electrons through the device and fills the hole, creating a single photon. The researchers believe that this fully controlled ultra-thin platform will allow the single photon emission in quantum communication is closer to reality.

"In the end, we need a fully integrated device that can be controlled by an electric pulse without having to use an external light source to assemble the laser in different parts of the circuit. "One of the main authors of this paper, from the University of Cambridge, Cavendish Laboratory (Cambridge sCavendishLaboratory) Professor MeteAtat re said at a news conference. "For single photon quantum communication and quantum networks between different nodes, we hope to get the light only through the driving current. There are many transmitters that are optically driven, but only a few are electrically driven. "

This study shows that two tungsten selenide can be used as an electronically controlled quantum emitter. However, the researchers also showed that the two tungsten sulfide is a new type of quantum transmitter which can produce a single photon in the visible light.

Atat re added: "we chose the two tungsten sulfide is because we want to see is not the single photon of different materials can emit different spectral range. Therefore, we find that the quantum emission is not the unique property of two tungsten selenide, which implies that many other layered materials may also have the properties of quantum dots. "

For more information about LED, please click on LED network or pay attention to WeChat public account (cnledw2013).