Quantum efficiency is the mean fraction of incident photons producing collected signal carriers. Noise-equivalent quantum efficiency can be lower when amplification adds fluctuations; this does not imply a corresponding loss of actual photon absorption.
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Quantum efficiency (QE) is a measure of how effectively a device converts incoming photons (light particles) into electrons or electrical signals. It is commonly used in fields such as photodetectors, solar cells, and imaging sensors to assess their performance. In the context of: 1. **Photodetectors**: Quantum efficiency refers to the ratio of the number of charge carriers (electrons or holes) generated to the number of photons incident on the device.