Are the two paths in an interferometer indistinguishable?

In summary, an interferometer is a scientific instrument that uses a beam splitter to split a beam of light into two paths and then recombines them to produce an interference pattern. This pattern reveals information about the properties of the light source. The two paths in an interferometer must be indistinguishable in length and properties for accurate measurements. However, in practice, there are always small differences that can affect the measurements, which scientists account for by using techniques such as high-quality components and advanced calibration methods.
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For the case of an electron passing through a double slit, there will be an interference pattern if it is indistinguishable which slit the electron passes through. If we put a light source behind the slits to measure which slit the electron passes through, the interference pattern is destroyed.

So by the same logic, since there is interference in an interferometer, it must be indistinguishable which of the two paths the light takes or a photon takes.
 
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Correct. Many modern "which way" experiments, such as the delayed choice quantum eraser, are based on interferometers.
 
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Related to Are the two paths in an interferometer indistinguishable?

1. What is an interferometer?

An interferometer is a scientific instrument used to measure small changes in light waves. It works by splitting a beam of light into two paths and then recombining them to produce an interference pattern, which can reveal information about the properties of the light source.

2. How does an interferometer work?

An interferometer works by using a beam splitter to divide a single beam of light into two paths. The two paths are then recombined, and the resulting interference pattern is analyzed to measure any changes in the light waves.

3. What is meant by "indistinguishable paths" in an interferometer?

Indistinguishable paths in an interferometer refer to the fact that the two paths that the light travels along are identical in length and properties. This is important because any differences between the two paths can affect the interference pattern and the accuracy of the measurements.

4. Are the two paths in an interferometer truly indistinguishable?

In theory, the two paths in an interferometer should be completely indistinguishable. However, in practice, there are always small differences that can affect the measurements. These differences can be caused by imperfections in the optical components or environmental factors such as temperature changes or vibrations.

5. How do scientists account for any differences between the two paths in an interferometer?

Scientists use various techniques to minimize any differences between the two paths in an interferometer. This can include using high-quality optical components, maintaining a stable environment, and using advanced calibration methods to ensure the accuracy of the measurements.

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