Decoherence and pointer states in small antiferromagnets: A benchmark test

Autor:	Donker, H. C., De Raedt, H., Katsnelson, M. I.
Rok vydání:	2016
Předmět:	Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	SciPost Phys. 2, 010 (2017)
Druh dokumentu:	Working Paper
DOI:	10.21468/SciPostPhys.2.2.010
Popis:	We study the decoherence process of a four spin-1/2 antiferromagnet that is coupled to an environment of spin-1/2 particles. The preferred basis of the antiferromagnet is discussed in two limiting cases and we identify two $\it{exact}$ pointer states. Decoherence near the two limits is examined whereby entropy is used to quantify the $\it{robustness}$ of states against environmental coupling. We find that close to the quantum measurement limit, the self-Hamiltonian of the system of interest can become dynamically relevant on macroscopic timescales. We illustrate this point by explicitly constructing a state that is more robust than (generic) states diagonal in the system-environment interaction Hamiltonian. Comment: 21 pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1612.03099 Zobrazit plný text záznamu View this record from Arxiv