China Building Global-Scale Quantum Internet, Demonstrates Quantum Video Communication
The first quantum-safe video conference was held between President Chunli Bai of the Chinese Academy of Sciences in Beijing and President Anton Zeilinger of the Austria Academy of Sciences in Vienna, as the first real-world demonstration of intercontinental quantum communication on September 29th.
Private and secure communications are fundamental human needs. In particular, with the exponential growth of Internet use and e-commerce, it is of paramount importance to establish a secure network with global protection of data. Traditional public key cryptography usually relies on the perceived computational intractability of certain mathematical functions.
A cross-disciplinary multi-institutional team of scientists from the Chinese Academy of Sciences, led by Professor Jian-Wei Pan, has spent more than ten years in developing a sophisticated satellite, named Micius, dedicated for quantum science experiments (for the project timeline, see Appendix), which was successfully launched on 16th August 2016, from Jiuquan, China, orbiting at an altitude of ~500 km .
Within a year after the launch, three key milestones that will be central to a global-scale quantum internet have been achieved: satellite-to-ground decoy-state QKD with kHz rate over a distance of ~1200 km (Liao et al. 2017, Nature 549, 43); satellite-based entanglement distribution to two locations on the Earth separated by ~1200 km and Bell test (Yin et al. 2017, Science 356, 1140), and ground-to-satellite quantum teleportation (Ren et al. 2017, Nature 549, 70). The effective link efficiencies in the satellite-based QKD were measured to be ~20 orders of magnitudes larger than direct transmission through optical fibers at the same length at 1200 km.
The satellite-based QKD has now been combined with metropolitan quantum networks, in which fibers are used to efficiently and conveniently to connect many users inside a city with a distance scale of ~100 km. For example, the Xinglong station has now been connected to the metropolitan multi-node quantum network in Beijing via optical fibers.
The Micius satellite can be further exploited as a trustful relay to conveniently connect any two points on the earth for high-security key exchange. Early this year, the Chinese team has implemented satellite-to-ground QKD in Xinglong. After that, the secure keys were stored in the satellite for 2 hours until it reached Nanshan station near Urumqi, by a distance of ~2500 km from Beijing. By performing another QKD between the satellite and Nanshan station, and using one-time-pad encoding, secure key between Xinglong and Nanshan were then established. To test the robustness and versatility of the Micius, QKD from the satellite to Graz ground station near Vienna has also been carried out successfully this June, as a collaboration between Professor Pan and Professor Anton Zeilinger’s group. Upon request, future similar experiments are also planned between China and Singapore, Italy, Germany, and Russia.
Source: http://www.ineffableisland.com/2017/10/china-building-global-scale-quantum.html
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