Experimental investigation of dynamical invariants in bipartite entanglement

O. Jiménez Farías, A. Valdés-Hernández, G. H. Aguilar, P. H. Souto Ribeiro, S. P. Walborn, L. Davidovich, Xiao Feng Qian, J. H. Eberly

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19 Scopus citations

Abstract

The nonconservation of entanglement, when two or more particles interact, sets it apart from other dynamical quantities, like energy and momentum, and does not allow the interpretation of the subtle dynamics of entanglement as a flow of this quantity between the constituents of the system. Nevertheless, we show that when the interaction between a qubit and its environment is described by an amplitude-decay channel, the conservation of the mean excitation number and the inclusion of a third party leads to an invariant expression involving the bipartite entanglement between each of the parties and the other two. We provide an experimental demonstration of this idea using entangled photons and generalize it to N-partite Greenberger-Horne-Zeilinger states.

Original languageEnglish
Article number012314
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume85
Issue number1
DOIs
StatePublished - 17 Jan 2012

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