Erlangen 2022 – scientific programme

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SYQC: Symposium Quantum Cooperativity of Light and Matter

SYQC 2: Quantum Cooperativity of Light and Matter - Session 2

SYQC 2.4: Talk

Thursday, March 17, 2022, 15:00–15:15, Audimax

A systematic study of entanglement mediated by a thermal reservoir. — •Sayan Roy, Christian Otto, Raphaël Menu, and Giovanna Morigi — Theoretical Physics, Department of Physics, Saarland University, 66123 Saarbrücken, Germany

Entanglement is the main reason that allows quantum protocols to surpass the classical ones [1]. However, because of its quantum nature, it gets destroyed due to decoherence processes that occur as a result of interaction of the system with its surrounding environment [2]. Here, we investigate a model where environment-induced entanglement is observed. We consider two non-interacting defect spins coupled to a common thermal reservoir, modeled by a spin-1/2 Ising chain in a transverse field. Hereby, each of the defect spins is coupled to only one spin of the chain. We analyze the time evolution of the density matrix of the two defect spins which are initially prepared in a separable state. We identify three different regimes characterizing the dynamics of quantum correlations, which depend on the strength of the coupling between defect spins and spin chain. We discuss several scenarios by varying the distance and coupling strength between the two spins and provide physical insights into the dynamics.
 
[1] R. Horodecki, M. Horodecki and K. Horodecki Rev. Mod. Phys. 81(2), 865-942 (2009).
[2] W.H. Zurek Rev. Mod. Phys. 75(3), 715-775, (2003).