A large-scale quantum photonic circuit. This is the discovery that is being carried out by an international team, also composed of Chinese researchers, which could pave the way for the production of components for the realization of an optical quantum computer, as explained by a study by the University of Bristol.
The integrated quantum photonics allows the control of individual light particles with inherently high stability and precision, but so far has been limited to small-scale demonstrations in which only a small number of components is integrated on a chip. Being able to scale these quantum circuits is of fundamental importance to increase the complexity and the computational power of modern quantum information processing technologies.
In this study, published in the journal Science, the researchers were able to integrate into a single chip with 550 optical components, allowing the integrated photonic chip – made using a scalable silicon photonic technology, similar to modern electronic circuits – to engage photons in incredible levels of precision.
“Our quantum chip allows us to reach unprecedented levels of precision and control of multidimensional entanglement, a key factor in many quantum information tasks of computing and communication,” said lead author, Dr Jianwei Wang from the University of Bristol.
The chip sets a new standard for the complexity and precision of quantum photonics, with immediate applications for quantum technologies. Prof. Qihuang Gong, the lead academic from Peking University, said: “The development of powerful large-scale integrated photonic quantum chips will provide an efficient route to the future applications in the fields of quantum communication, quantum computing and many others”.