China university of science and technology of jian-wei pan, zhao-yang lu Wang Dawei, Princeton university and zhejiang university Marlan Scully, Germany's university of Pittsburgh Sven Hofling Jonathan Dowling, Louisiana state university, Shanghai university of New York Tim Byrnes, cooperation, for the first time in the world experiment observed the quantum dots single photon and two-photon interference between the light from the sun, quantum entanglement and nonlocality. This work extends the quantum interference experiment between * photons to two * light sources 150 million kilometers apart. It is the first time to test the universality of the quantum statistical principle on an astronomical scale, and provides direct experimental evidence for quantization of the thermal light field. The findings were published recently in the international journal physical review letters as an editorial recommendation.

       quantum interference between photons is the basis of many quantum information technologies. This phenomenon cannot be explained by the classical electromagnetic wave theory, but the light field must be quantized. Since 1997, jian-wei pan and his colleagues through the single photon quantum states such as space, frequency and time of coherent manipulation and filtering precision, has led to much entangled photons and interference in the world the development of *, and systematically apply it to the transmission, long-distance quantum communication, quantum * reality condition, the security of quantum key distribution and optical quantum computing, etc. At present, the reported research work in the world has realized the quantum interference between a variety of light sources, including parametric down conversion, ion trap, cold atom ensemble, quantum dot and so on. The realization of quantum interference between light sources with higher * degree and longer distance can provide a new platform for fundamental inspection of quantum mechanics and application of long-distance quantum communication.

       The team from the university of science and technology of China has proposed for the first time to conduct quantum optical experiments with the sun, a natural long-distance thermal light source. In order to clearly observe high-contrast quantum interference, the main challenge of the experiment is to develop high-performance single-photon sources and multi-degree-of-freedom quantum erasure techniques. Pan jianwei and lu chaoyang et al. excited single quantum dots coupled with microcavity by pulsed resonance, and prepared single photon sources with single polarization, high efficiency, high purity and high homogeneity. On the basis, the team developed the ultra narrow band filter, super fast time identifying, detection of gating, single mode, a whole set of quantum erasing technologies such as spatial filtering experiment observed more than 50% of the classical limit of up to 80% of the interference in the contrast, clearly confirmed that the quantization character of the light heat, on the scale of the astronomical unit test the universality of the quantum bose statistical principle. Furthermore, the research team prepared an entangled state with a fidelity of up to 0.826 between the photon of sunlight and the single photon of the quantum dot, and used the entangled photon pair with no common historical source to conduct bell inequality test. The experiment obtained a violation of more than 3 times standard deviation, once again verifying the nonlocality of quantum mechanics.