Open quantum systems in thermal nonergodic environments

Parra-Murillo, Carlos A.; Bramberger, Max; Hubig, Claudius und De Vega, Ines (2021): Open quantum systems in thermal nonergodic environments. In: Physical Review A, Bd. 103, Nr. 3, 32204

Abstract

We analyze the dynamics of an open system coupled to a nonergodic environment for which the correlation function does not decay, leading to a failure of the weak coupling and Markov approximations standard in open systems. We show that nonergodicity appears for environments at finite temperatures that have non-Gaussian statistics and do not fulfill the eigenstate thermalization hypothesis. We illustrate our statements by considering a thermal spin-boson environment that models a gas of dye molecules, and show that nondecaying correlations are connected to a 1/f noise that extends to zero frequencies. This suggests the idea that nonergodic environments may be at the origin of the 1/f behavior observed in other hybrid environments such as the ones encountered in superconducting qubits.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 2469-9926
• Sprache: Englisch