Amorphous solids show surprisingly universal behaviour at low temperatures. The
prevailing wisdom is that this can be explained by the existence of two-state defects within …

The efficiency of the future devices for quantum information processing is limited mostly by
the finite decoherence rates of the individual qubits and quantum gates. Recently …

We report on long-term measurements of a highly coherent, nontunable superconducting
transmon qubit, revealing low-frequency burst noise in coherence times and qubit transition …

Experiments have lagged theory in exploring chemical interactions at temperatures so low
that translational degrees of freedom can no longer be treated classically. The difficulty has …

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 …

Since the very first experiments, superconducting circuits have suffered from strong coupling
to environmental noise, destroying quantum coherence and degrading performance. In state …

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 …

Noise within solid-state systems at low temperatures can typically be traced back to material
defects. In amorphous materials, these defects are broadly described by the tunneling two …

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 …

Material-based two-level systems (TLSs), appearing as defects in low-temperature devices
including superconducting qubits and photon detectors, are difficult to characterize. In this …