Speaker
Description
In recent years, extensive studies on quantum correlations in various scenarios, such as non-inertial
frames, curved spacetime, and an expanding universe have been performed [1–6]. In the framework
of the theory of open systems based on completely positive quantum dynamical semigroups, we
investigate the time evolution of Gaussian quantum entanglement of two bosonic modes associated
with a scalar quantum field in de Sitter space and in interaction with a thermal reservoir. We show
that quantum entanglement strongly depends on the squeezing of the bimodal state, the parameters
characterizing the thermal environment, the curvature parameter of de Sitter space, and the mass
parameter. The thermal environment and the curvature have a destructive influence on the entangle-
ment, whose survival time depends on the competition between the contrary effects provided by the
squeezing of the bimodal state, the curvature, and the thermal bath. The entanglement is minimized
for values 1/2 and 3/2 of the mass parameter, corresponding to the conformally coupled scalar field,
respectively minimally coupled massless field [7].
[1] P.M. Alsing, I. Fuentes-Schuller, R.B. Mann, T.E. Tessier, Phys. Rev. A 74, 032326 (2006).
[2] D.E. Bruschi, A. Dragan, I. Fuentes, J. Louko, Phys. Rev. D 86, 025026 (2012).
[3] G. Adesso, S. Raga, D. Girolami, Class. Quantum Grav. 29, 224002 (2012).
[4] J. Doukas, E.G. Brown, A. Dragan, R.B. Mann, Phys. Rev. A 84, 012306 (2013).
[5] B. Richter, Y. Omar Phys. Rev. A 92, 022334 (2015).
[6] M. Calamanciuc, A. Isar, Results Phys. 55, 107167 (2023).
[7] M. Calamanciuc, A. Isar, submitted for publication.
