Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Posters: Quantum Optics and Photonics I
Q 13.16: Poster
Monday, March 9, 2020, 16:30–18:30, Empore Lichthof
Dynamics of entanglement creation between two spins coupled to a chain — •Christian Otto1, Pierre Wendenbaum1,2, Bruno G. Taketani3, Endre Kajari1, Giovanna Morigi1, and Dragi Karevski2 — 1Universität des Saarlandes — 2Universite de Lorraine — 3Universidade Federal de Santa Catarina
We study the dynamics of entanglement between two spins which is created by the coupling to a common thermal reservoir. The reservoir is a spin-1/2 Ising transverse field chain thermally excited, the two defect spins couple to two spins of the chain which can be at a macroscopic distance. In the weak-coupling and low-temperature limit the spin chain is mapped onto a bath of linearly interacting oscillators using the Holstein-Primakoff transformation. We analyse the time evolution of the density matrix of the two defect spins for transient times and deduce the entanglement which is generated by the common reservoir. We discuss several scenarios for different initial states of the two spins and for varying distances.