140 citations · 1.1k across the 59 of their papers we have counts for
14 papers · 1 filter
Time Evolution of Typical Pure States from a Macroscopic Hilbert Subspace
Stefan Teufel, Roderich Tumulka, Cornelia Vogel
We consider a macroscopic quantum system with unitarily evolving pure state and take it for granted that different macro states correspond to mutually orthogon…
Finding spectral gaps in quasicrystals
Paul Hege, Massimo Moscolari, Stefan Teufel
We present an algorithm for reliably and systematically proving the existence of spectral gaps in Hamiltonians with quasicrystalline order, based on numerical calculations on finit…
Bohmian Trajectories for Hamiltonians with Interior-Boundary Conditions
Detlef Dürr, Sheldon Goldstein, Stefan Teufel +2
Recently, there has been progress in developing interior-boundary conditions (IBCs) as a technique of avoiding the problem of ultraviolet divergence in non-relativistic quantum fie…
Avoiding Ultraviolet Divergence by Means of Interior-Boundary Conditions
Stefan Teufel, Roderich Tumulka
We describe here a novel way of defining Hamiltonians for quantum field theories (QFTs), based on the particle-position representation of the state vector and involving a condition…
Hamiltonians Without Ultraviolet Divergence for Quantum Field Theories
Stefan Teufel, Roderich Tumulka
We propose a way of defining Hamiltonians for quantum field theories without any renormalization procedure. The resulting Hamiltonians, called IBC Hamiltonians, are mathematically…
Resonance phenomena in the interaction of a many-photon wave packet and a qubit
Omri Gat, Max Lein, Stefan Teufel
We demonstrate that a highly excited quantum electromagnetic mode strongly interacting with a single qubit exhibits several distinct resonances in addition to the Bloch-Siegert res…
Semiclassical approximations for adiabatic slow-fast systems
Stefan Teufel
In this letter we give a systematic derivation and justification of the semiclassical model for the slow degrees of freedom in adiabatic slow-fast systems first found by Littlejohn…
Constrained Quantum Systems as an Adiabatic Problem
Jakob Wachsmuth, Stefan Teufel
We derive the effective Hamiltonian for a quantum system constrained to a submanifold (the constraint manifold) of configuration space (the ambient space) in the asymptotic limit w…
On the exit statistics theorem of many particle quantum scattering
Detlef Duerr, Stefan Teufel
We review the foundations of the scattering formalism for one particle potential scattering and discuss the generalization to the simplest case of many non interacting particles. W…
Space-adiabatic Decoupling to All Orders
Gianluca Panati, Herbert Spohn, Stefan Teufel
A systematic perturbation scheme is developed for approximate solutions to the time-dependent Schroedinger equation with a space-adiabatic Hamiltonian. For a particular isolated en…
Scattering theory from microscopic first principles
Detlef Duerr, Sheldon Goldstein, Stefan Teufel +1
We sketch a derivation of abstract scattering theory from the microscopic first principles defined by Bohmian mechanics. We emphasize the importance of the flux-across-surfaces the…
Quantum spacetime without observers: ontological clarity and the conceptual foundations of quantum gravity
Sheldon Goldstein, Stefan Teufel
We explore the possibility of a Bohmian approach to the problem of finding a quantum theory incorporating gravitational phenomena. The major conceptual problems of canonical quantu…
Locality and Causality in Hidden Variables Models of Quantum Theory
Stefan Teufel, Karin Berndl, Detlef Dürr +2
Motivated by Popescu's example of hidden nonlocality, we elaborate on the conjecture that quantum states that are intuitively nonlocal, i.e., entangled, do not admit a local causal…
Comment on ``Hidden quantum nonlocality revealed by local filters''
Karin Berndl, Stefan Teufel
In Section 3 of his paper (N. Gisin, Phys. Lett. A 210 (1996) 151), Gisin argues that a ``careless application of generalized quantum measurements can violate Bell's inequality eve…