Experimental investigation of the dynamics of entanglement: Sudden death, complementarity, and continuous monitoring of the environment

Salles, A., de Melo, F., Almeida, M. P., Hor-Meyll, M., Walborn, S. P., Souto Ribeiro, P. H. and Davidovich, L. (2008) Experimental investigation of the dynamics of entanglement: Sudden death, complementarity, and continuous monitoring of the environment. Physical Review A: Atomic, Molecular and Optical Physics, 78 2: . doi:10.1103/PhysRevA.78.022322

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Author Salles, A.
de Melo, F.
Almeida, M. P.
Hor-Meyll, M.
Walborn, S. P.
Souto Ribeiro, P. H.
Davidovich, L.
Title Experimental investigation of the dynamics of entanglement: Sudden death, complementarity, and continuous monitoring of the environment
Journal name Physical Review A: Atomic, Molecular and Optical Physics   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2008-08-13
Year available 2008
Sub-type Article (original research)
DOI 10.1103/PhysRevA.78.022322
Open Access Status File (Publisher version)
Volume 78
Issue 2
Total pages 15
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract We report on an experimental investigation of the dynamics of entanglement between a single qubit and its environment, as well as for pairs of qubits interacting independently with individual environments, using photons obtained from parametric down-conversion. The qubits are encoded in the polarizations of single photons, while the interaction with the environment is implemented by coupling the polarization of each photon with its momentum. A convenient Sagnac interferometer allows for the implementation of several decoherence channels and for the continuous monitoring of the environment. For an initially entangled photon pair, one observes the vanishing of entanglement before coherence disappears. For a single qubit interacting with an environment, the dynamics of the complementarity relations connecting single-qubit properties and its entanglement with the environment is experimentally determined. The evolution of a single qubit under continuous monitoring of the environment is investigated, demonstrating that a qubit may decay even when the environment is found in the unexcited state. This implies that entanglement can be increased by local continuous monitoring, which is equivalent to entanglement distillation. We also present a detailed analysis of the transfer of entanglement from the two-qubit system to the two corresponding environments, between which entanglement may suddenly appear, and show instances for which no entanglement is created between dephasing environments, nor between either of them and the corresponding qubit: the initial two-qubit entanglement gets transformed into legitimate multiqubit entanglement of the Greenberger-Horne-Zeilinger type.
Keyword Light coherence
Polarisation
Quantum computing
Quantum entanglement
Quantum optics
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article Number: 022322

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
Centre for Quantum Computer Technology Publications
 
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Created: Sat, 21 Mar 2009, 01:03:49 EST by Ruth Forrest on behalf of ARC Ctr of Excell for Quantum Computer Technology