Passive optical network (PON) technology is the key technology to break bottleneck of “the last kilometer”; however, the problem of the security of PON has not been solved well. Since the optical line terminal is always active in the whole procedure of communication, i.e., OLT can easily capture the information exchanging between any two of
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1. Probabilistic cloning and quantum computationWe discuss the usefulness of quantum cloning and present examples of quantum computation tasks for which quantum cloning offers an advantage which cannot be matched by any approach that does not resort to it. In these quantum computations, we need to distribute quantum information contained in states about which we
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In the latter part of last century, scientists founded the conception of quantum cryptography on the basis of quantum mechanics.This encryption method uses quantum state as the key used for the encryption and decryption of information. Anyone who wants to decrypt the key changes the quantum state and doesn’t obtain userful information. Compared with the
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According to the Moore’s law, the computer power will double for constant cost roughly once every two years. The difficulty for breaking a cryptosystem has been reducing continually, which brings great threat to the classical cryptosystem based on computational complexity. On the other hand, the growth of the computer’s computing power requires higher integration and
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Quantum information theory is a new subject which combines quantum mechanics and classical information theory. Quantum information theory can exceed the classical limit of information theory in many ways and realize many unimaginable tasks for classical information theory. Quantum information theory provides with new principles and methods for future revolution of information theory. Quantum cryptography
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As we know, the security of most classical cryptosystems is based on computational complexity assumptions. With the fast development of people’s ability of computation, especially the presentation of some parallel quantum algorithms, this kind of security is severely challenged. Quantum cryptography is the combination of quantum mechanics and cryptography. Despite of the computational ability of
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Quantum cryptography, the most remarkable application in quantum information, is the synthesis of quantum mechanics with the art of code-making (cryptography). Quantum secret sharing (QSS) is one of the important directions, which provides a new way for managing keys securely.The contributions of this dissertation are mainly on the protocol design and analysis of quantum secret
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Quantum communication and quantum cryptography is a subject which combines traditional cryptography and quantum mechanics. It provides an optional new method for information security. Different from traditional cryptography which based on the assumed difficulty of mathematical problems, the security of quantum cryptography is based on Heisenberg uncertainty principle and quantum no-cloning theorem. Quantum cryptography not
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Quantum cryptography, which is a cross-discipline subject combining cryptography with quantum mechanics, has become a very significant issue. Quantum system has some unique attributes: the Heisenberg uncertainty principle and no-cloning theorem. Hence, eavesdropping on quantum carrier in quantum cryptography system may disturb the quantum state, which ensures the unconditional security of quantum cryptography. As the
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Because of the unconditional security ensured by the Heisenberg uncertainty principle and quantum no-cloning theory, quantum communication has progressed quickly. There are several remarkable branches of quantum communication, such as Quantum Key Distribution (QKD), Quantum Secret Sharing (QSS), Deterministic Secure Quantum Communication (DSQC), Quantum Authentication (QA) and so on. Since there is no practical perfect
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