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Conferences > EQEC > 2009 > ED > ED_P10
  • CLEO/Europe and EQEC 2009 Conference Digest
  • (Optica Publishing Group, 2009),
  • paper ED_P10

On the impossibility to perform a global unitary operation sequentially

L. Lamata, J. León, D. Pérez-García, D. Salgado, and E. Solano

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Abstract

Quantum evolution is described by a unitary operator acting on a certain initial state. Thus, unitary dynamics is of central relevance when describing quantum systems. In the modem language of quantum information theory, global unitary operators can always be decomposed in a circuit model, composed of one- and two-qubit gates that are applied upon the qubits in a way depending on the specific unitary [1], In most nontrivial cases, for a given unitary, some of the qubits are acted upon more than once.

© 2009 IEEE

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