Abstract
A simple two-qubit model showing quantum phase transitions as a consequence of ground-state-level crossings is studied in detail. Using the system’s concurrence as an entanglement measure and heat capacity as a marker of thermodynamical properties, we obtain an analytical expression giving the latter in terms of the former. A protocol allowing an experimental measure of entanglement is then presented and compared with a related proposal recently reported by Wieśniak, Vedral, and Brukner.
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Leggio, B., Napoli, A., Nakazato, H. et al. Heat capacity and entanglement measure in a simple two-qubit model. J Russ Laser Res 32, 362–371 (2011). https://doi.org/10.1007/s10946-011-9224-0
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DOI: https://doi.org/10.1007/s10946-011-9224-0