Researchers design Pyramid shaped quantum dot LED, or will promote the development of quantum computing

Quantum computing is widely regarded as the next generation of global computing technology innovation. Google, Intel and IBM and other giants in the field at present has invested millions, which will promote faster, more efficient processing, to meet the future of computing, high-speed network, data encryption and other applications, such as national defense, security and sensing.

The day before, the Irish National Institute of Tindall (Tyndall National Institute) the researchers used lithography technology scalable and compatible with the design of a factory, Pyramid quantum dot shaped light-emitting diode (LED), is expected to generate entangled photon correlation function and state of quantum computing.

Project leader Dr. Emanuele Pelucchi said that the future of the study may be used in quantum computing research, in order to accelerate the application of quantum technology.

The Tindall institute uses nanotechnology to power the Pyramid - shaped quantum dot arrays to produce entangled photons. By using the intrinsic nano structure of the conical structure, especially for the design of self-assembled vertical quantum wires, quantum dots can be selectively injected into the current. The results reported in this paper are an important step in the design of quantum photonic integrated circuits, which lays the foundation for the quantum information processing tasks of thousands or even more synchronous operation.

The researchers restored the original substrate to the top of the Pyramid structure, so as to improve the number of orders of magnitude of the embedded components than the built-in embedded components. The top and bottom contacts are then designed to selectively inject current into a single QD in the center of the Pyramid structure. The key is to make use of the self calibration technique to make it easy to realize mass production.

By contacting all of the LED, the researchers had to think about 1300 LED for a lot of analysis, but also plans to control the LED to achieve a better performance selectivity, as well as to compensate for the uneven process.

Ideally, for quantum information processing, the researchers hope to use the LED, as a completely different source of entangled photons. Photon capture efficiency is also very low, about 1%, therefore, the researchers expect to use different techniques (such as the construction of the material stress and electric field) to improve.

Tindall researchers have been able to produce entangled photons of the quantum dot light-emitting diode related programs, in theory can be used in quantum computing in the information coding. Pelucchi explains that this is not the only solution for LED to generate entangled photons, but as described in the article in nature photonics, the method and material have an important impact on the future of quantum technology.

Traditional digital computation relies on binary switches, and quantum computation uses the quantum states of events, such as entangled photons or multiple states of atoms, to achieve information coding. In theory, this can promote faster and more powerful computer processing, but the current technology is difficult to support large-scale development.

The innovation lies in the design of a scalable array of electric quantum dots, which uses readily available materials and traditional semiconductor manufacturing technology. This method can realize the direct acquisition of entangled photon source. The key technology of this method lies in the position control of quantum dots and the large-scale manufacturing technology.

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