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Título

Sequential Implementation of Global Quantum Operations

AutorLamata, Lucas ; León, Juan ; Pérez-García, D.; Salgado, D.; Solano, E.
Palabras clave[PACS] Quantum computation architectures and implementations
[PACS] Foundations of quantum mechanics; measurement theory
[PACS] Quantum state engineering and measurements (quantum optics)
Fecha de publicación31-oct-2008
EditorAmerican Physical Society
CitaciónPhysical Review Letters 101(18): 180506 (2008)
ResumenWe study the possibility for a global unitary applied on an arbitrary number of qubits to be decomposed in a sequential unitary procedure, where an ancillary system is allowed to interact only once with each qubit. We prove that sequential unitary decompositions are in general impossible for genuine entangling operations, even with an infinite-dimensional ancilla, being the controlled-NOT gate a paradigmatic example. Nevertheless, we find particular nontrivial operations in quantum information that can be performed in a sequential unitary manner, as is the case of quantum error correction and quantum cloning.
Descripción4 pages, 3 figures.-- PACS nrs.: 03.67.Lx; 03.65.Ta; 42.50.Dv.-- ArXiv pre-print available at: http://arxiv.org/abs/0711.3652
Versión del editorhttp://dx.doi.org/10.1103/PhysRevLett.101.180506
URIhttp://hdl.handle.net/10261/12255
DOI10.1103/PhysRevLett.101.180506
ISSN0031-9007
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