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 Wie´sniak, Vedral, and Brukner.
Leggio, B., Napoli, A., Nakazato, H., Messina, A. (2011). HEAT CAPACITY AND ENTANGLEMENT MEASURE IN A SIMPLE TWO-QUBIT MODEL. JOURNAL OF RUSSIAN LASER RESEARCH, 32, 362-371 [10.1007/s10946-011-9224-0].
HEAT CAPACITY AND ENTANGLEMENT MEASURE IN A SIMPLE TWO-QUBIT MODEL
LEGGIO, Bruno;NAPOLI, Anna;MESSINA, Antonino
2011-01-01
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 Wie´sniak, Vedral, and Brukner.
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