Related Experiment Video
Updated: Jul 12, 2026
10:40
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
A phase microscope for quantum gases.
J C Brüggenjürgen1, M S Fischer1, C Weitenberg1,2
1Institute for Quantum Physics, University of Hamburg, Hamburg, Germany.
Science (New York, N.Y.)
|July 9, 2026
Summary
Researchers studied coherence in ultracold Bose gases using advanced imaging. They observed algebraic decay of phase correlations in the superfluid phase, offering insights into quantum system coherence.
Area of Science:
- Quantum physics
- Condensed matter physics
Background:
- Coherence properties are fundamental to quantum systems, underpinning phenomena like superconductivity.
- Understanding coherence in ultracold atomic gases is crucial for advancing quantum technologies.
Purpose of the Study:
- To investigate the coherence properties of an ultracold Bose gas in a 2D optical lattice.
- To analyze coherence across the thermal phase transition using novel imaging techniques.
Main Methods:
- Utilized direct matter-wave imaging of higher Talbot revivals.
- Developed and employed a phase microscope for site-resolved phase fluctuation mapping.
Main Results:
- Observed algebraic decay of phase correlations in the superfluid phase.
- Found a linear temperature dependence of the exponent governing this decay.
- Successfully mapped phase fluctuations to density fluctuations.
Conclusions:
- The developed techniques provide high spatial resolution for studying coherence.
- These methods can be applied to investigate coherence in strongly correlated quantum systems.
- The findings offer new avenues for exploring quantum phase transitions and coherence phenomena.
Related Concept Videos
01:26Phase Contrast and Differential Interference Contrast Microscopy
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
01:20The Phase Rule
The phase rule describes the relationship between the variance (degrees of freedom), the number of components, and the number of phases in a system at equilibrium.Variance is a concept that denotes the number of independent intensive properties (properties are those that do not depend on the amount of material in the system), such as temperature, pressure, and composition, that can be altered without impacting the number of phases in equilibrium.In a single-component system, such as pure water,...