30 citations · 79 across the 6 of their papers we have counts for
5 papers · 1 filter
Renormalization group for open quantum systems using environment temperature as flow parameter
K. Nestmann, M. R. Wegewijs
We present the -flow renormalization group method, which computes the memory kernel for the density-operator evolution of an open quantum system by lowering the physical tempera…
The connection between time-local and time-nonlocal perturbation expansions
K. Nestmann, M. R. Wegewijs
There exist two canonical approaches to describe open quantum systems by a time-evolution equation: the Nakajima-Zwanzig quantum master equation, featuring a time-nonlocal memory k…
Fermionic duality: General symmetry of open systems with strong dissipation and memory
V. Bruch, K. Nestmann, J. Schulenborg +1
We consider the exact time-evolution of a broad class of fermionic open quantum systems with both strong interactions and strong coupling to wide-band reservoirs. We present a nont…
How quantum evolution with memory is generated in a time-local way
Konstantin Nestmann, Valentin Bruch, Maarten Rolf Wegewijs
Two widely used but distinct approaches to the dynamics of open quantum systems are the Nakajima-Zwanzig and time-convolutionless quantum master equation, respectively. Although bo…
Five approaches to exact open-system dynamics: Complete positivity, divisibility and time-dependent observables
Viktor Reimer, Maarten Rolf Wegewijs, Konstantin Nestmann +1
To extend the classical concept of Markovianity to an open quantum system, different notions of the divisibility of its dynamics have been introduced. Here we analyze this issue by…