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Probing quantum discord in a Heisenberg dimer compound
Tanmoy Chakraborty1, Harkirat Singh, Sourabh Singh
1Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur Campus, PO: BCKV CampusMain Office, Mohanpur-741252, Nadia, West Bengal, India.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 27, 2013
Summary
Researchers quantified quantum discord in a Heisenberg spin 1/2 dimer compound using magnetic and thermal measurements. This study reveals entanglement and correlations in NH4CuPO4, H2O, demonstrating quantum properties through experimental data.
Area of Science:
- Quantum physics
- Condensed matter physics
- Quantum information
Background:
- Quantum discord quantifies quantum correlations beyond classical entanglement.
- Heisenberg spin dimers are model systems for studying quantum phenomena.
Purpose of the Study:
- To quantitatively estimate quantum discord in a Heisenberg spin 1/2 dimer compound (NH4CuPO4, H2O).
- To investigate the presence of entanglement and correlations in the material through experimental measurements.
Main Methods:
- Experimental magnetic susceptibility and specific heat measurements were conducted.
- Data analysis employed the Heisenberg isolated dimer model.
- Internal energy was derived by integrating specific heat data.
Main Results:
- Quantum discord, total correlations, and spin-spin correlation functions were quantified and plotted against temperature.
- Violation of Bell's inequality was experimentally demonstrated.
- The results signify the presence of entanglement in NH4CuPO4, H2O.
Conclusions:
- Experimental magnetic and thermal data provide a quantitative estimation of quantum discord.
- NH4CuPO4, H2O exhibits entanglement and significant quantum correlations.
- The study validates experimental approaches for characterizing quantum properties in materials.
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