Pan Jianwei and Lu Chaoyang of the University of Science and Technology of China have collaborated with Xu Xiaodong of the University of Washington and Yao Wang of the University of Hong Kong to discover non-classical single photon emitters for the first time in graphene-like monoatomic semiconductor materials, connecting quantum optics and two-dimensional materials. These two important areas have opened the way to a new type of optical quantum device. This work was recently published online in Nature's Nanotechnology, a magazine in Nature. The “News Perspective†column in the same period wrote an article commenting that the work “opens up a new area of ​​researchâ€.
In 2004, Andrei Heim and Konstantin Novoselov succeeded in the preparation of graphene (ie monoatomic carbon) from the University of Manchester and won the 2010 Nobel Prize in physics. However, graphene does not have an electronic structure that can directly emit light, which limits its application in optoelectronic devices. Recently, a new monolayer of graphene-like material, tungsten diselenide, has attracted wide attention due to its unique photoelectric properties. However, all previous studies on monoatomic layered two-dimensional materials have focused on classical optics, and quantum optical phenomena have not been observed experimentally.
Teams led by Pan Jianwei, Lu Chaoyang and others have demonstrated for the first time in the world that the atomic defects in the two-dimensional monatomic layer of tungsten selenide can become single-photon emitting devices with good monochromatic and polarization properties and can pass The applied magnetic field greatly regulates the emission wavelength. Compared with other single-photon systems, this single-atom photonic device based on single atomic layer not only facilitates the reading and control of photons, but also can be easily prepared and integrated with other optoelectronic device platforms, such as micro-nano structure resonators, to achieve High-efficiency light quantum information processing circuit. The theory shows that through the electric field control, it is also possible to realize the quantum control of multiple degrees of freedom for single electrons, and it can be applied to the research of fault-tolerant quantum computation in the future. Prof. Lu Chaoyang introduced that due to the potential prospects and novel physical significance of quantum control based on the single atomic layer, this field will soon become the focus of intense international competition. (Reporter Wu Changfeng correspondent Yang Baoguo)
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