Crucial Role of Quantum Entanglement in Bulk Properties of Solids

Details Crucial Role of Quantum Entanglement in Bulk Properties of Solids Crucial Role of Quantum Entanglement in Bulk Properties of Solids

2004-10-18

arxiv.org/abs/quant-ph/0410138v1

Phys. Rev. A 73, 012110 (2006)

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevA.73.012110

We demonstrate that the magnetic susceptibility of strongly alternating antiferromagnetic spin-1/2 chains is an entanglement witness. Specifically, magnetic susceptibility of copper nitrate (CN) measured in 1963 (Berger et al., Phys. Rev. 132, 1057 (1963)) cannot be described without presence of entanglement. A detailed analysis of the spin correlations in CN as obtained from neutron scattering experiments (Xu et al., Phys. Rev. Lett. 84, 4465 (2000)) provides microscopic support for this interpretation. We present a quantitative analysis resulting in the critical temperature of 5K in both, completely independent, experiments below which entanglement exists.

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