What is Possible Without Disturbing Quantum Signals?
نویسندگان
چکیده
Consider a situation in which a quantum system is secretly prepared in a state chosen from the known set of n states. We show that the fundamental properties of classical and quantum signals lead to a principle that gives a definite distinction between the operations that preserve the states of the system and those that do not. Many types of no-cloning and no-imprinting conditions can easily be derived from this principle. The principle also gives a unified view on how various schemes of quantum cryptography work. PACS numbers: 03.67.Dd 03.65.Bz, 89.70.+c Typeset using REVTEX
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تاریخ انتشار 2001