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Optical implementation and entanglement distribution in Gaussian valence bond states
Centre for Quantum Computation, DAMTP, Univ. of Cambridge, UK.
Centre for Quantum Computation, DAMTP, Univ. of Cambridge, UK.
2007 (English)In: Optics and Spectroscopy, ISSN 0030-400X, E-ISSN 1562-6911, Vol. 103, no 2, 178-186 p.Article in journal (Refereed) Published
Abstract [en]

We study Gaussian valence bond states of continuous variable systems, obtained as the outputs of projection operations from an ancillary space of M infinitely entangled bonds connecting neighboring sites, applied at each of $N$ sites of an harmonic chain. The entanglement distribution in Gaussian valence bond states can be controlled by varying the input amount of entanglement engineered in a (2M+1)-mode Gaussian state known as the building block, which is isomorphic to the projector applied at a given site. We show how this mechanism can be interpreted in terms of multiple entanglement swapping from the chain of ancillary bonds, through the building blocks. We provide optical schemes to produce bisymmetric three-mode Gaussian building blocks (which correspond to a single bond, M=1), and study the entanglement structure in the output Gaussian valence bond states. The usefulness of such states for quantum communication protocols with continuous variables, like telecloning and teleportation networks, is finally discussed.

Place, publisher, year, edition, pages
2007. Vol. 103, no 2, 178-186 p.
National Category
Physical Sciences Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
URN: urn:nbn:se:uu:diva-150544DOI: 10.1134/S0030400X07080024OAI: oai:DiVA.org:uu-150544DiVA: diva2:407661
Available from: 2011-03-31 Created: 2011-03-31 Last updated: 2017-12-11Bibliographically approved

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Ericsson, Marie

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