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© Dr. Rüdiger Paschotta

Last update: 2009-10-04

Quantum Efficiency

Definition: percentage of input photons which contribute to a desired effect

The quantum efficiency (or quantum yield) is often of interest for processes which convert light in some way. It is defined as the percentage of the input photons which contribute to the desired effect. Examples are:

  • In a laser gain medium, the pump process may require the transfer of laser-active ions from one electronic level (into which the ions are pumped) to the upper level of the laser transition. This pump quantum efficiency is the fraction of the absorbed pump photons which contributes to the population of the upper laser level. This efficiency is close to unity (100%) for many laser gain media, but can be substantially smaller for others. It may depend on factors like the excitation density and parasitic absorption processes.
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© Dr. Rüdiger Paschotta

Last update: 2009-10-04

Quantum Efficiency

Definition: percentage of input photons which contribute to a desired effect

The quantum efficiency (or quantum yield) is often of interest for processes which convert light in some way. It is defined as the percentage of the input photons which contribute to the desired effect. Examples are:

  • In a laser gain medium, the pump process may require the transfer of laser-active ions from one electronic level (into which the ions are pumped) to the upper level of the laser transition. This pump quantum efficiency is the fraction of the absorbed pump photons which contributes to the population of the upper laser level. This efficiency is close to unity (100%) for many laser gain media, but can be substantially smaller for others. It may depend on factors like the excitation density and parasitic absorption processes.
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Quantum Core engine is engineered to provide better fuel efficiency without affecting power delivery .Aluminium die cast cylinder head with cast iron has been adopted for better heat dissipation, resulting in improved performance of the engine.

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  • Quantum applied science is a young discipline of physics and technology, which transitions, some of the stranger characteristics of quantum mechanics, especially quantum entanglement and most recently quantum tunneling, into virtual applications such as quantum computing, quantum coding, quantum simulation, quantum metrology, quantum sensing, and quantum imaging.
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An argument against a small time quantum: Efficiency. A small time quantum requires the timer to generate interrupts with short

intervals. Each interrupt causes a context switch, so overhead increases with a larger number of interrupts.

An argument for a small time quantum: Response time. A large time quantum will reduce the overhead of context switching since

interrupts will be generated with relatively long intervals, hence there will be fewer interrupts. However, a short job will have to wait

longer time on the ready queue before it can get to execute on the processor. With a short time quantum, such a short job will finish

quicker and produces the result to the end user faster than with a longer time quantum

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In the universe energy, matter and go as per quantum. Energy is released in quantum of photon. Electron has a quantum mass. Proton has quantum mass. Both has a quantum charge. Neutron has a quantum mass. Speed of light is a quantum. Big bang is a quantum event essentially occurring at particular mass. It takes a quantum energy for shifting of electrons from one shell to other. In photo-luminescence light energy is released in quantum.

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