arXiv:quant-ph/0201033AbstractReferencesReviewsResources
Quantum Computation by Quantum Operations on Mixed States
Published 2002-01-09Version 1
Usually models for quantum computations deal with unitary gates on pure states. In this paper we generalize the usual model. We consider a model of quantum computations in which the state is an operator of density matrix and the gates are quantum operations, not necessarily unitary. A mixed state (operator of density matrix) of n two-level quantum systems is considered as an element of $4^{n}$-dimensional operator Hilbert space. Unitary quantum gates and nonunitary quantum operations for n-qubit system are considered as generalized quantum gates acting on mixed state. In this paper we study universality for quantum computations by quantum operations on mixed states.
Comments: 11 pages, LaTeX
Categories: quant-ph
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