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Micius (satellite)
Quantum Experiments at Space Scale (QUESS; ), is a Chinese research project in the field of quantum physics. Tiangong-2 is China's second Space Laboratory module which was launched on 15 September 2016. Tiangong-2 carries a total of 14 mission and experiment packages, including Space-Earth quantum key distribution () and laser communications experiment to facilitate space-to-ground quantum communication. A satellite, nicknamed Micius or Mozi () after the ancient Chinese philosopher, is operated by the Chinese Academy of Sciences, as well as ground stations in China. The University of Vienna and the Austrian Academy of Sciences are running the satellite's European receiving stations. QUESS is a proof-of-concept mission designed to facilitate quantum optics experiments over long distances to allow the development of quantum encryption and quantum teleportation technology. Quantum encryption uses the principle of entanglement to facilitate communication that can absolutely detect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mozi
Mozi (; ; Latinized as Micius ; – ), original name Mo Di (), was a Chinese philosopher who founded the school of Mohism during the Hundred Schools of Thought period (the early portion of the Warring States period, –221 BCE). The ancient text ''Mozi'' contains material ascribed to him and his followers. Mozi taught that everyone is equal in the eyes of heaven. He believed that the decision of who is in power should be based on meritocracy, or those who are worthy of power should receive power. Mozi invoked heaven and called upon the Sage Kings to support his precedents. Born in what is now Tengzhou, Shandong Province, Mozi founded the school of Mohism, which argued strongly against both Confucianism and Daoism. Mozi's philosophy emphasized universal love, social order, the will of heaven, sharing, and honoring the worthy. During the Warring States period, Mohism was actively developed and practiced in many states, but fell out of favor when the legalist Qin dynasty ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jian-Wei Pan
Pan Jianwei (; born 11 March 1970) is a Chinese quantum physicist, university administrator and professor of physics at the University of Science and Technology of China. Pan is known for his work in the field of quantum entanglement, quantum information and quantum computers. In 2017, he was named one of Nature's 10, which labelled him "Father of Quantum". He is an academician of the Chinese Academy of Sciences and the World Academy of Sciences and Executive Vice President of the University of Science and Technology of China. He also serves as one of the Vice Chairman of Jiusan Society. Early life and education Pan was born in Dongyang, Jinhua, Zhejiang province in 1970. In 1987, he entered the University of Science and Technology of China (USTC), from which he received his bachelor's and master's degrees. He received his PhD from the University of Vienna in Austria, where he studied and worked in the group led by Nobel prize winning physicist Anton Zeilinger. Contributions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tibet Autonomous Region
The Tibet Autonomous Region or Xizang Autonomous Region, often shortened to Tibet or Xizang, is a Provinces of China, province-level Autonomous regions of China, autonomous region of the China, People's Republic of China in Southwest China. It was overlayed on the traditional Tibetan regions of Ü-Tsang and Kham. It was formally established in 1965 to replace the Tibet Area (administrative division), Tibet Area, the former Administrative divisions of China, administrative division of the People's Republic of China (PRC) established after the annexation of Tibet by the People's Republic of China, annexation of Tibet. The establishment was about five years after the 1959 Tibetan uprising and the dismissal of the Kashag, and about 13 years after the original annexation. The current borders of the Tibet Autonomous Region were generally established in the 18th century and include about half of historic Tibet, or the Tibet, ethno-cultural Tibet. The Tibet Autonomous Region spans ov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shiquanhe
Shiquanhe (), known in Tibetan as Sênggêkanbab () or Sênggêzangbo, is the main town and administrative seat of Ngari Prefecture, Tibet Autonomous Region, China. Shiquanhe is located on the bank of Sênggê Zangbo, the source stream of the Indus River, close to its confluence with the Gartang River. Name This modern Chinese-built town is named after the Sengge Zangbo river, the main headwater of the Indus River, on whose banks it is located. It is called "Sengge Zangbo" or "Sengge Khabab" in Tibetan and "Shiquanhe" in Chinese. Being the headquarters of Ngari Prefecture (which is known in Chinese under the Sinicized form of its name, Ali Prefecture), the town is also commonly known in English as Ngari or Ali () Town; this is what many guidebooks use as the primary name for the town. In Tibetan, Ngari is only the name for the prefecture, and not the town. Being the county seat of the Gar County, it is also referred to as Gar (). it may be labeled that way on maps.E.g. Des ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great-circle Distance
The great-circle distance, orthodromic distance, or spherical distance is the distance along a great circle. It is the shortest distance between two points on the surface of a sphere, measured along the surface of the sphere (as opposed to a straight line through the sphere's interior). The distance between two points in Euclidean space is the length of a straight line between them, but on the sphere there are no straight lines. In spaces with curvature, straight lines are replaced by geodesics. Geodesics on the sphere are circles on the sphere whose centers coincide with the center of the sphere, and are called 'great circles'. The determination of the great-circle distance is part of the more general problem of great-circle navigation, which also computes the azimuths at the end points and intermediate way-points. Through any two points on a sphere that are not antipodal points (directly opposite each other), there is a unique great circle. The two points separate the gre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beijing
} Beijing ( ; ; ), alternatively romanized as Peking ( ), is the capital of the People's Republic of China. It is the center of power and development of the country. Beijing is the world's most populous national capital city, with over 21 million residents. It has an administrative area of , the third in the country after Guangzhou and Shanghai. It is located in Northern China, and is governed as a municipality under the direct administration of the State Council with 16 urban, suburban, and rural districts.Figures based on 2006 statistics published in 2007 National Statistical Yearbook of China and available online at archive. Retrieved 21 April 2009. Beijing is mostly surrounded by Hebei Province with the exception of neighboring Tianjin to the southeast; together, the three divisions form the Jingjinji megalopolis and the national capital region of China. Beijing is a global city and one of the world's leading centres for culture, diplomacy, politics, finance, busi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beijing Astronomical Observatory
Beijing Astronomical Observatory (BAO) is an observatory located around 150 kilometres northeast of Beijing, China. It was founded in 1958 and is part of the Chinese Academy of Sciences The Chinese Academy of Sciences (CAS); ), known by Academia Sinica in English until the 1980s, is the national academy of the People's Republic of China for natural sciences. It has historical origins in the Academia Sinica during the Republi .... The observatory comprises 5 observing stations. The principal observing site for optical and infrared is called Xinglong.http://www.astronomyca.com/b/beijing-astronomical-observatory.htm Facilities Xinglong The Xinglong observatory, situated at 960 metres above sea level, contains a 2.16-metre reflector telescope (China's largest), and a 1.26-m infrared telescope. The planned "LAMOST", or Large Sky Area Multi-Object Fiber Spectroscopic Telescope will be located there. Miyun There is also a radio astronomy site at Miyun. It comprises 28 dishes, e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ürümqi
Ürümqi ( ; also spelled Ürümchi or without umlauts), formerly known as Dihua (also spelled Tihwa), is the capital of the Xinjiang Uyghur Autonomous Region in the far northwest of the People's Republic of China. Ürümqi developed its reputation as a leading cultural and commercial center during the Qing dynasty in the 19th century. With a census population of 4 million in 2020, Ürümqi is the second-largest city in China's northwestern interior after Xi'an as well as the largest in Central Asia in terms of population. According to the ''Guinness Book of Records'', Ürümqi is the most remote city from any sea in the world. Ürümqi has seen significant economic development since the 1990s and currently serves as a regional transport node and a cultural, political and commercial center. Ürümqi is one of the top 500 cities in the world by scientific research output, as tracked by the Nature Index. The city is also home to Xinjiang University, a comprehensive univer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xinjiang Astronomical Observatory
Xinjiang Astronomical Observatory (XAO; ) of the Chinese Academy of Sciences was known as Ürümqi Astronomical Observatory before it was renamed in January 2011. The current research at XAO spans many fields of astronomy. It consists of radio astronomy, optical astronomy and applications of astronomy, especially pulsars, star formation and evolution, galaxies and cosmology, high energy astrophysics, microwave receiver, digital technology, GPS, and so on. The Radio Astrophysics Laboratory of XAO is a member of the radio astronomy key laboratories in the Chinese Academy of Sciences, and has also been awarded the status of Key Laboratory of Xinjiang Uygur Autonomous Region. XAO operates the Nanshan site, Kashgar site, Qitai site and other two independent ground stations. Facilities The observatory's facilities include the Nanshan Radio Telescope (see List of radio telescopes#Asia), located in Gangou Township, Ürümqi County (). The 25 m, telescope site in Nanshan of XAO is one o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Line-of-sight Propagation
Line-of-sight propagation is a characteristic of electromagnetic radiation or acoustic wave propagation which means waves travel in a direct path from the source to the receiver. Electromagnetic transmission includes light emissions traveling in a straight line. The rays or waves may be diffracted, refracted, reflected, or absorbed by the atmosphere and obstructions with material and generally cannot travel over the horizon or behind obstacles. In contrast to line-of-sight propagation, at low frequency (below approximately 3 MHz) due to diffraction, radio waves can travel as ground waves, which follow the contour of the Earth. This enables AM radio stations to transmit beyond the horizon. Additionally, frequencies in the shortwave bands between approximately 1 and 30 MHz, can be refracted back to Earth by the ionosphere, called skywave or "skip" propagation, thus giving radio transmissions in this range a potentially global reach. However, at frequencies above ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantum Channel
In quantum information theory, a quantum channel is a communication channel which can transmit quantum information, as well as classical information. An example of quantum information is the state of a qubit. An example of classical information is a text document transmitted over the Internet. More formally, quantum channels are completely positive (CP) trace-preserving maps between spaces of operators. In other words, a quantum channel is just a quantum operation viewed not merely as the reduced dynamics of a system but as a pipeline intended to carry quantum information. (Some authors use the term "quantum operation" to also include trace-decreasing maps while reserving "quantum channel" for strictly trace-preserving maps.) Memoryless quantum channel We will assume for the moment that all state spaces of the systems considered, classical or quantum, are finite-dimensional. The memoryless in the section title carries the same meaning as in classical information theory: the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
