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Phys. Rev. A 73, 012110 (2006) [4 pages]

Crucial role of quantum entanglement in bulk properties of solids

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Časlav Brukner1,2,3, Vlatko Vedral4,5, and Anton Zeilinger1,2
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

We demonstrate that two well-established experimental techniques of condensed-matter physics, neutron-diffraction scattering and measurement of magnetic susceptibility, can be used to detect and quantify macroscopic entanglement in solids. Specifically, magnetic susceptibility of copper nitrate (CN) measured in 1963 cannot be described without presence of entanglement. A detailed analysis of the spin correlations in CN as obtained from neutron-scattering experiment from 2000 provides microscopic support for this interpretation and gives the value for the amount of entanglement. We present a quantitative analysis resulting in the critical temperature of 5 K in both, completely independent, experiments below which entanglement exists.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.73.012110
DOI:
10.1103/PhysRevA.73.012110
PACS:
03.65.Ud, 03.67.−a
 
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