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    Quantum Processors and Controllers

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    In this paper is presented an abstract theory of quantum processors and controllers, special kind of quantum computational network defined on a composite quantum system with two parts: the controlling and controlled subsystems. Such approach formally differs from consideration of quantum control as some external influence on a system using some set of Hamiltonians or quantum gates. The model of programmed quantum controllers discussed in present paper is based on theory of universal deterministic quantum processors (programmable gate arrays). Such quantum devices may simulate arbitrary evolution of quantum system and so demonstrate an example of universal quantum control. Keywords: Quantum, Computer, Control, Processor, UniversalComment: LaTeXe, 7 pp, 2 col, v3: revised and extended (+50%), PhysCon0