The manner in which states of some quantum systems become effectively classical is of
great significance for the foundations of quantum physics, as well as for problems of …

Single trapped ions represent elementary quantum systems that are well isolated from the
environment. They can be brought nearly to rest by laser cooling, and both their internal …

I Introduction.-1 Review of Quantum Mechanics.-1.1 Time-Dependent Perturbation Theory.-
1.2 The Rabi Two-Level Problem.-1.2. 1 Light Shifts.-1.2. 2 The Dressed Atom Picture.-1.2. 3 …

The counter-intuitive aspects of quantum physics have been for long illustrated by thought
experiments, from Einstein's photon box to Schrödinger's cat. These experiments have now …

After they have interacted, quantum particles generally behave as a single nonseparable
entangled system. The concept of entanglement plays an essential role in quantum physics …

Interference with atomic and molecular matter waves is a rich branch of atomic physics and
quantum optics. It started with atom diffraction from crystal surfaces and the separated …

Quantum superposition lies at the heart of quantum mechanics and gives rise to many of its
paradoxes. Superposition of de Broglie matter waves has been observed for massive …

A mesoscopic superposition of quantum states involving radiation fields with classically
distinct phases was created and its progressive decoherence observed. The experiment …

The quantum walk is the quantum analog of the well-known random walk, which forms the
basis for models and applications in many realms of science. Its properties are markedly …

The theory of quantum mechanics applies to closed systems. In such ideal situations, a
single atom can, for example, exist simultaneously in a superposition of two different spatial …