Quantum information science is a new frontier subject combining quantum mechanics and information science. The quantum nature of particle superposition, entanglement, and measurement is applicable for more efficient information processing, computation, transmission, and storage. The development of quantum information industry promises more powerful computing power, high security information communications, and a deeper understanding of nature. It is expected to resolve numerous scientific problems that are difficult to be effectively solved by existing classical techniques. For example, absolutely secure information transmission [1,2], exponentially or polynomially accelerating the resolving of hard scientific problems [3,4], efficient simulation of molecular structures , and precision measurement beyond the standard quantum limit .
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