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Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Refrigerators and Heat Pumps01:07

Refrigerators and Heat Pumps

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Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
A household refrigerator removes heat from...
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Social Traps01:41

Social Traps

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Social traps are negative situations where people get caught in a direction or relationship that later proves to be unpleasant, with no easy way to back out of or avoid. The concept was orignally introduced by John Platt who applied psychology to Garrett Hardin's "Tragedy of the Commons", where in New England herd owners could let their cattle graze in the common ground. This situation seems like a good idea, but an individual could have an advantage. If they owned...
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Common Ion Effect03:24

Common Ion Effect

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
46.6K
Precipitation of Ions03:11

Precipitation of Ions

30.3K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
30.3K

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Related Experiment Video

Updated: Jan 30, 2026

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
11:45

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Published on: August 17, 2017

15.3K

Quantum absorption refrigerator with trapped ions.

Gleb Maslennikov1, Shiqian Ding1,2, Roland Hablützel1

  • 1Centre for Quantum Technologies, National University of Singapore, 3 Science Dr 2, Singapore, 117543, Singapore.

Nature Communications
|January 16, 2019
PubMed
Summary
This summary is machine-generated.

Researchers experimentally created a quantum absorption refrigerator using trapped ions. This device utilizes quantum effects to achieve cooling below classical thermodynamic limits, even in the single-shot regime.

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Area of Science:

  • Quantum Thermodynamics
  • Quantum Information Science
  • Experimental Quantum Physics

Background:

  • Thermodynamics is being extended to single quantum systems.
  • Quantum effects can enhance the performance of heat engines.
  • Implementing quantum effects in heat machines remains challenging.

Purpose of the Study:

  • To experimentally realize a quantum absorption refrigerator.
  • To investigate the dynamics and steady-state properties of this quantum refrigerator.
  • To compare cooling performance using thermal states versus quantum squeezing and assess single-shot performance.

Main Methods:

  • Utilized a system of three trapped ions.
  • Coupled three normal modes of motion via a trilinear Hamiltonian.
  • Investigated dynamics, steady-state properties, and cooling capabilities under different quantum resource conditions (thermal states, squeezing, single-shot regime).

Main Results:

  • Demonstrated a functional quantum absorption refrigerator using trapped ions.
  • Showcased cooling below steady-state energy levels.
  • Achieved cooling below a benchmark set by classical thermodynamics.
  • Highlighted the potential of quantum resources like squeezing and coherence for enhanced refrigeration.

Conclusions:

  • Experimental realization of a quantum absorption refrigerator is feasible.
  • Quantum resources significantly enhance refrigerator performance.
  • Quantum refrigerators can outperform classical thermodynamic limits, particularly in the single-shot regime.