Crucial role of quantum entanglement in bulk properties of solids

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aslav Brukner,^1,2,3 Vlatko Vedral,^4,5 and Anton Zeilinger^1,2
¹Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, A-1090 Wien, Austria
²Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, A-1090 Wien, Austria
³The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BW, United Kingdom
⁴The School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
⁵The Erwin Schrödinger Institute for Mathematical Physics, Boltzmanngasse 9, A-1090 Vienna, Austria

Received 3 October 2005; published 23 January 2006

Wedemonstrate that two well-established experimental techniques of condensed-matter physics, neutron-diffractionscattering and measurement of magnetic susceptibility, can be used todetect and quantify macroscopic entanglement in solids. Specifically, magnetic susceptibilityof copper nitrate (CN) measured in 1963 cannot be describedwithout presence of entanglement. A detailed analysis of the spincorrelations in CN as obtained from neutron-scattering experiment from 2000provides microscopic support for this interpretation and gives the valuefor the amount of entanglement. We present a quantitative analysisresulting in the critical temperature of 5 K in both,completely independent, experiments below which entanglement exists.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.012110
DOI:	10.1103/PhysRevA.73.012110
PACS:	03.65.Ud; 03.67.-a 03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) 03.67.-a Quantum information YEAR: 2006
KEYWORDS:	copper compounds, quantum entanglement, neutron diffraction, magnetic susceptibility

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