The anomalous low-temperature properties of glasses arise from intrinsic excitable entities,
so-called tunneling Two-Level-Systems (TLS), whose microscopic nature has been baffling …

Quantum two-level systems (TLSs) intrinsic to glasses induce decoherence in many modern
quantum devices, such as superconducting qubits. Although the low-temperature physics of …

Parasitic two-level tunnelling systems originating from structural material defects affect the
functionality of various microfabricated devices by acting as a source of noise. In particular …

While two-level systems (TLSs) are ubiqitous in solid state systems, microscopic
understanding of their nature remains an outstanding problem. Conflicting …

Parasitic two-level tunneling systems (TLS) emerge in amorphous dielectrics and constitute
a serious nuisance for various microfabricated devices, where they act as a source of noise …

We use a tunneling model for two-level systems in insulators that takes into account the
interaction between them and a slow power-law dependence of their density of states. We …

The low-temperature properties of amorphous solids are usually explained in terms of
atomic-scale tunneling two level systems (TLS). For almost 20 years, individual TLS have …

In structurally disordered solids, some atoms or small groups of atoms are able to quantum
mechanically tunnel between two nearly equivalent sites. These atomic tunneling systems …

Recent experimental results showing atypical nonlinear absorption and marked deviations
from well known universality in the low temperature acoustic and dielectric losses in …

Recent progress with microfabricated quantum devices has revealed that an ubiquitous
source of noise originates in tunneling material defects that give rise to a sparse bath of …