title: Quantum correlated heat engine with spin squeezing.
abstract: We propose a four-level quantum heat engine in an Otto cycle with a working substance of two spins subject to an external magnetic field and coupled to each other by a one-axis twisting spin squeezing nonlinear interaction. We calculate the positive work and the efficiency of the engine for different parameter regimes. In particular, we investigate the effects of quantum correlations at the end of the two isochoric processes of the Otto cycle, as measured by the entanglement of formation and quantum discord, on the work extraction and efficiency. The regimes where the quantum correlations could enhance the efficiency and work extraction are characterized.
authors.affiliation: Department of Physics, Abant Izzet Baysal University, Bolu 14280, Turkey.
authors.forename: Ferdi
authors.initials: F
authors.lastname: Altintas
authors.affiliation: Department of Physics, Koç University, İstanbul, Sarıyer 34450, Turkey.
authors.forename: Ali Ü C
authors.initials: AÜ
authors.lastname: Hardal
authors.affiliation: Department of Physics, Koç University, İstanbul, Sarıyer 34450, Turkey.
authors.forename: Özgür E
authors.initials: ÖE
authors.lastname: Müstecaplıoglu
mesh_terms: D006358:Hot Temperature; D060526:Magnetic Fields; D017711:Nonlinear Dynamics; D011789:Quantum Theory