Marcin Wieśniak et al 2005 New J. Phys. 7 258 doi:10.1088/1367-2630/7/1/258
Magnetic susceptibility as a macroscopic entanglement witness
Marcin Wieśniak1,2,3, Vlatko Vedral1,4 and Časlav Brukner1,5
Show affiliationsWe show that magnetic susceptibility can reveal spin entanglement between individual constituents of a solid, while magnetization describes their local properties. We then show that magnetization and its variance (equivalent to magnetic susceptibility for a wide class of systems) satisfy complementary relation in the quantum-mechanical sense. It describes sharing of (quantum) information in the solid between spin entanglement and local properties of its individual constituents. Magnetic susceptibility is shown to be a macroscopic (thermodynamical) spin entanglement witness that can be applied without complete knowledge of the specific model (Hamiltonian) of the solid.
- PACS
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03.67.Hk Quantum communication
75.30.Cr Saturation moments and magnetic susceptibilities
03.65.Ta Foundations of quantum mechanics; measurement theory
- Subjects
- Dates
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Issue 1 (December 2005)
Received 16 September 2005
Published 29 December 2005
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Magnetic susceptibility as a macroscopic entanglement witness
Marcin Wieśniak et al 2005 New J. Phys. 7 258
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