Dagong Global Credit Rating (大公国际资信评估有限公司; pinyin: Dàgōng Guójì Zīxìn Pínggū Yǒuxiàn Gōngsī) is a credit rating agency based in China. In standard Mandarin, Dagong is first half of the four-character idiom Dagong wusi (大公无私) which can be translated into English as 'impartial and without prejudice'. == History == The company was established in 1994, following approval by the People's Bank of China and the State Economic and Trade Division of the People's Republic of China. In May 2009, an agreement of mutual cooperation was signed with Xinhua news agency, reported as "promiting a national credit...

This is a list of countries by credit rating, showing long-term foreign currency credit ratings for sovereign bonds as reported by the three major credit rating agencies: Standard & Poor's, Fitch, and Moody's. The ratings of DBRS, China Chengxin Credit Rating Group, Dagong and JCR are also included. The list also includes all country subdivisions issuing sovereign bonds, but it excludes regions, provinces and municipalities issuing sub-sovereign bonds. == Countries' ratings in different methods == === Standard & Poors === For S&P, a bond is considered investment grade if its credit rating is BBB...

Quantum information science is an area of study based on the idea that information science depends on quantum effects in physics. It includes theoretical issues in computational models as well as more experimental topics in quantum physics including what can and cannot be done with quantum information. The term quantum information theory is sometimes used, but it fails to encompass experimental research in the area. Subfields include: Quantum computing, which deals on the one hand with the question how and whether one can build a quantum computer and on the other hand, algorithms that harness its...

Quantum computing studies theoretical computation systems (quantum computers) that make direct use of quantum-mechanical phenomena, such as superposition and entanglement, to perform operations on data. Quantum computers are different from digital computers based on transistors. Whereas digital computers require data to be encoded into binary digits (bits), each of which is always in one of two definite states (0 or 1), quantum computation uses qubits (quantum bits), which can be in superpositions of states. A theoretical model is the quantum Turing machine, also known as the universal quantum...