A new sufficient entanglement condition based on Cauchy-Schwarz violations of the partial transpose is introduced and used to link thermal entanglement in the Jaynes-Cummings and quantum Rabi models to their symmetries.
Molina-Esp ´ ıritu, R
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Mixed State Entanglement Via the Cauchy-Schwarz Inequality
A new sufficient entanglement condition based on Cauchy-Schwarz violations of the partial transpose is introduced and used to link thermal entanglement in the Jaynes-Cummings and quantum Rabi models to their symmetries.