Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 66: Poster: Entanglement

FM 66.6: Poster

Wednesday, September 25, 2019, 16:30–18:30, Tents

Non-equilibrium states of two coupled oscillators and entanglement spectra — •Carsten Henkel — University of Potsdam, Institute of Physics and Astronomy, Germany

We study models of coupled quantum systems that are driven out of (local) equilibrium by coupling to different heat baths [1–6]. Two coupled oscillators, each embedded in its “own” bath of oscillators, provide a simple, analytically solvable system. We study fluctuation-dissipation relations and correlation functions (covariance matrices) beyond the Markov and rotating-wave approximations. Deviations from local equilibrium provide a characterisation in the frequency domain of the entanglement between the two oscillators [2]. Interesting generalisations may involve coupled spins or spin baths. Relevant applications are heat transport [1,4–6] and single molecular emitters coupled to nano-antennas [7].

[1] A. Pérez-Madrid, J. M. Rubí, and L. C. Lapas, Phys. Rev. B 77 (2008) 155417

[2] Anne Ghesquière, Ilya Sinayskiy, and Francesco Petruccione, Phys. Scr. 2012 (2012) 014017

[3] I. Dorofeyev, Can. J. Phys. 91 (2013) 537

[4] Svend-Age Biehs and Girish S. Agarwal, J. Opt. Soc. Am. B 30 (2013) 700

[5] Gabriel Barton, J. Phys. Condens. Matt. 27 (2015) 214005

[6] Gabriel Barton, J. Stat. Phys. 165 (2016) 1153

[7] Ruben Esteban, Javier Aizpurua, and Garnett W Bryant, New J. Phys. 16 (2014) 013052