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dc.contributor.author
Nicacio, Fernando
dc.contributor.author
Valdés Hernández, Andrea
dc.contributor.author
Majtey, Ana Paula
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dc.contributor.author
Toscano, Fabricio
dc.date.available
2019-03-22T18:36:04Z
dc.date.issued
2017-10
dc.identifier.citation
Nicacio, Fernando; Valdés Hernández, Andrea; Majtey, Ana Paula; Toscano, Fabricio; Unified framework to determine Gaussian states in continuous-variable systems; American Physical Society; Physical Review A; 96; 4; 10-2017; 1-15; 042341
dc.identifier.issn
2469-9926
dc.identifier.uri
http://hdl.handle.net/11336/72319
dc.description.abstract
Gaussian states are the backbone of quantum information protocols with continuous-variable systems whose power relies fundamentally on the entanglement between the different modes. In the case of global pure states, knowledge of the reduced states in a given bipartition of a multipartite quantum system bears information on the entanglement in such bipartition. For Gaussian states, the reduced states are also Gaussian, so their determination requires essentially the experimental determination of their covariance matrix. Here we develop strategies to determine the covariance matrix of an arbitrary n-mode bosonic Gaussian state through measurement of the total phase acquired when appropriate metaplectic evolutions, associated with quadratic Hamiltonians, are applied. Simply one-mode metaplectic evolutions, such rotations, squeezing, and shear transformations, in addition to a single two-mode rotation, allows us to determine all the covariance matrix elements of an n-mode bosonic system. All the single-mode metaplectic evolutions are applied conditionally to a state in which an ancilla qubit is entangled with the n-mode system. The ancillary system provides, after measurement, the value of the total phase of each evolution. The proposed method is experimentally suited to implement in the most currently used continuous-variable systems.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Physical Society
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Bosonic Gaussian States
dc.subject
Entanglement
dc.subject.classification
Otras Ciencias Físicas
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Unified framework to determine Gaussian states in continuous-variable systems
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-03-18T19:28:04Z
dc.journal.volume
96
dc.journal.number
4
dc.journal.pagination
1-15; 042341
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Nicacio, Fernando. Universidade Federal do Rio de Janeiro; Brasil
dc.description.fil
Fil: Valdés Hernández, Andrea. Universidad Nacional Autónoma de México; México
dc.description.fil
Fil: Majtey, Ana Paula. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Toscano, Fabricio. Universidade Federal do Rio de Janeiro; Brasil
dc.journal.title
Physical Review A
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1103/PhysRevA.96.042341
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/pra/abstract/10.1103/PhysRevA.96.042341
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