131 citations · 912 across the 45 of their papers we have counts for
9 papers · 1 filter
Non-Markovian noise that cannot be dynamically decoupled by periodic spin echo pulses
Daniel Burgarth, Paolo Facchi, Martin Fraas +1
Dynamical decoupling is the leading technique to remove unwanted interactions in a vast range of quantum systems through fast rotations. But what determines the time-scale of such…
Geometry and response of Lindbladians
Victor V. Albert, Barry Bradlyn, Martin Fraas +1
Markovian reservoir engineering, in which time evolution of a quantum system is governed by a Lindblad master equation, is a powerful technique in studies of quantum phases of matt…
Distinguishing decoherence from alternative quantum theories by dynamical decoupling
Christian Arenz, Robin Hillier, Martin Fraas +1
A longstanding challenge in the foundations of quantum mechanics is the verification of alternative collapse theories despite their mathematical similarity to decoherence. To this…
Bayesian quantum frequency estimation in presence of collective dephasing
Katarzyna Macieszczak, Martin Fraas, Rafal Demkowicz-Dobrzanski
We advocate a Bayesian approach to optimal quantum frequency estimation - an important issue for future quantum enhanced atomic clock operation. The approach provides a clear insig…
Optimal parametrizations of adiabatic paths
J. E. Avron, M. Fraas, G. M. Graf +1
The parametrization of adiabatic paths is optimal when tunneling is minimized. Hamiltonian evolutions do not have unique optimizers. However, dephasing Lindblad evolutions do. The…
Landau-Zener tunneling for dephasing Lindblad evolutions
J. E. Avron, M. Fraas, G. M. Graf +1
We derive an analog of the Landau-Zener adiabatic tunneling formula for an open, two-level system coupled to a memoryless, dephasing bath. The derivation rests on a geometric view…
A remark on helical waveguides
Pavel Exner, Martin Fraas
Motivated by a proposal to create an optical helix-shaped waveguides for cold atoms and molecules, we discuss local perturbations which can create bound states in such a setting. T…
Resonance asymptotics in the generalized Winter model
Pavel Exner, Martin Fraas
We consider a modification of the Winter model describing a quantum particle in presence of a spherical barrier given by a fixed generalized point interaction. It is shown that the…
The decay law can have an irregular character
Pavel Exner, Martin Fraas
Within a well-known decay model describing a particle confined initially within a spherical potential shell, we consider the situation when the undecayed state has an unusual e…