Related Experiment Video
Updated: Feb 22, 2026

11:03
An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
9.1K
Dynamics of Fragmented Condensates and Macroscopic Entanglement
1Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA.
Physical Review Letters
|September 27, 2017
Summary
In weakly coupled condensates, relative phase impacts collisions. Stronger interactions lock phases, leading to entangled superfluid fragments after separation.
Area of Science:
- * Quantum physics
- * Condensed matter physics
Background:
- * The behavior of colliding superfluids is crucial for understanding quantum phenomena.
- * The role of relative phase in order parameters during condensate collisions is not fully understood.
Purpose of the Study:
- * To investigate how interaction strength affects the phase dynamics of colliding condensates.
- * To determine the impact of phase locking on the entanglement of resulting superfluid fragments.
Main Methods:
- * Theoretical modeling of two-condensate collisions.
- * Analysis of order parameter phase evolution under varying coupling strengths.
Main Results:
- * Weak coupling allows relative phase to influence collision outcomes.
- * Increasing interaction strength leads to rapid phase locking of order parameters.
- * Strong coupling results in phase rigidity and entanglement of separated superfluid fragments.
Conclusions:
- * Interaction strength is a critical factor in determining the phase dynamics of colliding condensates.
- * Phase locking in strongly coupled systems leads to emergent entanglement in superfluid fragments.
Related Concept Videos
Entropy
36.7K
Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
36.7K
Entropy
3.7K
The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
Consider an infinitesimal step in the expansion, which...
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
Consider an infinitesimal step in the expansion, which...
3.7K
Entropy and Solvation
8.6K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
8.6K
Phase Transitions: Vaporization and Condensation
21.7K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
21.7K
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model
835
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
835
Entropy Change in Reversible Processes
3.3K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
3.3K

