2013/04/06 by Heiner Kohler, Andreas Hackl, Stefan Kehrein
Computer Science · Physics and Astronomy · #Asymmetry #Coherence (philosophical gambling strategy) #Condensed matter physics #Delocalized electron #Frustration #Metastability #Non-equilibrium thermodynamics #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum decoherence #Quantum mechanics #Spectroscopy and Quantum Chemical Studies #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.88.205122
22 pages, 9 figures
arxiv created 2013/04/06 · openalex publication_date 2013/11/15 · arxiv updated 2015/06/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Using flow equations and equilibrium and nonequilibrium dynamics of a two-level system (TLS) is investigated, which couples Ohmically via noncommuting components to two independent oscillator baths. In equilibrium, the two-level energy splitting is protected when the TLS is coupled symmetrically to both baths. A critical asymmetry angle separates the localized from the delocalized phase. Real-time decoherence of a nonequilibrium initial state is studied as well. The short-time dynamics exhibits initial slips on the scale of the cutoff frequency of the bath modes. Moreover, whereas for a single bath decay of coherence depends crucially on the chosen initial state, for a symmetric coupling to two baths this dependence vanishes.