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Related Concept Videos

Cohesion01:07

Cohesion

Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a surface,...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...

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High-pressure Sapphire Cell for Phase Equilibria Measurements of CO2/Organic/Water Systems
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Squeezed states in a Bose-Einstein condensate.

C Orzel1, A K Tuchman, M L Fenselau

  • 1Physics Department, Yale University, New Haven, CT 06520, USA.

Science (New York, N.Y.)
|March 27, 2001
PubMed
Summary
This summary is machine-generated.

Scientists manipulated atom number statistics in Bose-Einstein condensates using controlled tunneling and interactions. This research achieved number-squeezed quantum states, advancing atom interferometry sensitivity and quantum phase transition studies.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Condensed matter physics

Background:

  • Bose-Einstein condensates (BECs) exhibit quantum properties sensitive to their environment.
  • Controlling atom number statistics in mesoscopic traps is crucial for quantum technologies.

Purpose of the Study:

  • To manipulate and probe atom number statistics in BECs confined in mesoscopic traps.
  • To generate and study number-squeezed quantum states of atoms.
  • To explore adiabatic transitions between different quantum states.

Main Methods:

  • Utilizing an array of weakly linked mesoscopic traps to confine BECs.
  • Employing atom interference as a sensitive probe for atom number statistics.
  • Controlling the tunneling rate between traps and intra-trap atom-atom interactions.

Main Results:

  • Successfully manipulated atom number statistics, observing sub-Poissonian number fluctuations.
  • Demonstrated adiabatic transitions between number-squeezed states and coherent states.
  • Achieved control over quantum states of the atom field.

Conclusions:

  • The generated quantum states offer potential for enhanced sensitivity in atom interference-based instruments.
  • This work provides a platform for fundamental studies of quantum phase transitions.
  • Precise control over quantum states in mesoscopic systems is achievable.