Phase-sensitive measurements of order parameters for ultracold atoms through two-particle interferometry.

Phase Sensitive Measurements of Order Parameters for Ultracold Atoms through Two Particles Interferometry

Atom interferometry with trapped Bose–Einstein condensates: impact of atom–atom interactions

Interferometry with ultracold atoms promises the possibility of ultraprecise and ultrasensitive measurements in many fields of physics, and is the basis of our most precise atomic clocks. Key to a high sensitivity is the possibility to achieve long measurement times and precise readout. Ultracold atoms can be precisely manipulated at the quantum level and can be held for very long times in trap...

Quantum coherent tractor beam effect for atoms trapped near a nanowaveguide

We propose several schemes to realize a tractor beam effect for ultracold atoms in the vicinity of a few-mode nanowaveguide. Atoms trapped near the waveguide are transported in a direction opposite to the guided mode propagation direction. We analyse three specific examples for ultracold (23)Na atoms trapped near a specific nanowaveguide (i.e. an optical nanofibre): (i) a conveyor belt-type tra...

Observation of quantum criticality with ultracold atoms in optical lattices.

Quantum criticality emerges when a many-body system is in the proximity of a continuous phase transition that is driven by quantum fluctuations. In the quantum critical regime, exotic, yet universal properties are anticipated; ultracold atoms provide a clean system to test these predictions. We report the observation of quantum criticality with two-dimensional Bose gases in optical lattices. On...

Entanglement of atoms via cold controlled collisions

The controlled manipulation of entangled states of N particle systems is fundamental to the study of basic aspects of quantum theory [1,2], and provides the basis of applications such as quantum computing and quantum communications [3,4]. Engineering entanglement in real physical systems requires precise control of the Hamiltonian operations and a high degree of coherence. Achieving these condi...