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The official website of the German Institute of Technology in Karlsruhe (KIT) announced on the 27th that the scientists of the university led an international research team composed of scientists from Poland and Russia and solved a major constraint on the use of photonic circuits in light-quantum computers. For the first time, a complete success was achieved. The quantum optical structure is integrated into the chip. This latest achievement, published in the journal Nature Photonics, will help light-quantum computers use data encryption, ultra-fast calculation of big data, and quantum simulation of highly complex systems as soon as possible.
Because carbon nanotubes are less than one hair diameter, they are the best choice for the smallest light sources in photonic circuits. When they are irradiated with laser light, they emit many single photons. However, since the existing chips contain electrical components and do not receive additional laser systems, such laser technology that excites carbon nanotubes to emit photons is difficult to integrate into existing chips, and has become a constraint condition for the development of light quantum computers.
New research uses currents flowing through carbon nanotubes to stimulate carbon nanotubes to emit a single photon. The research team uses carbon nanotubes as a single photon source and detectors as superconducting nanowires. The carbon nanotubes and two detectors are connected to nanophotonic waveguides, respectively. The resulting light structure can be counted after being cooled by liquid helium. Single photon. The device can be integrated into existing chips. Ralph Crook, a KIT nanotechnology expert, said: “Our circuit is a major advancement in the field of photonics. Now we can fully use current to stimulate carbon nanotubes to emit single photons, overcoming the constraints that hinder the use of light quantum computers. "(Reporter Nie Cuirong)
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