Has anyone tested a polarization filter sending through photon by photon?

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Discussion Overview

The discussion revolves around the testing of polarization filters using photon-by-photon experiments, specifically exploring the expected outcomes when vertically polarized light is sent through a filter set at 45 degrees. Participants express interest in finding relevant experimental papers and discuss the feasibility and implications of such tests.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant suggests that sending 1000 photons through a 45-degree filter should yield approximately 500 photons on the other side, depending on the setup quality.
  • Another participant doubts that a paper documenting such an experiment would pass peer review, recommending textbooks instead.
  • A different participant argues that low-power beams of incoherent light indirectly perform this experiment, noting the common use of filters in practice.
  • One participant appreciates the analogy comparing the experiment's verification to the existence of the sun, while excluding certain possibilities from consideration.
  • Another participant reiterates the initial claim about photon transmission through the filter and provides a link to a relevant paper.
  • A later reply acknowledges the provided link but questions the necessity of a highly efficient source, suggesting that a BBO crystal could be used to confirm photon behavior in a manner similar to the Delayed Choice Quantum Eraser experiment.

Areas of Agreement / Disagreement

Participants express differing views on the existence and relevance of experimental papers on the topic, with some believing such papers are unnecessary or unlikely to exist, while others seek them out. The discussion remains unresolved regarding the necessity of specific experimental setups and the implications of the findings.

Contextual Notes

Participants do not reach a consensus on the need for high-efficiency sources or the validity of existing literature, and there are assumptions about the quality of experimental setups that are not fully explored.

calinvass
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To properly test a filter, I understand we can use a source of vertically polarized light. We send photon by photon say 1000 though a filter at, for example, 45 degrees the count the ones on the other side. We should get roughly 500, depending of the quality of the setup.
I was interested in a link to a paper that presents such an experiment.
 
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Don't think such a paper would make it through the reviewing process. Better check textbooks and such.
 
Every low-power beam of incoherent light does that experiment indirectly. Nothing would work if the filters wouldn't filter as they should.

It is hard to find publications for something everyone uses. As comparison: It is easy to find papers discussing solar flares, but hard to find papers verifying that the sun does exist.
 
I like the analogy with the sun.
Thanks.
I can safely exclude this possibility( in the op).
 
Last edited:
BvU said:
Don't think such a paper would make it through the reviewing process. Better check textbooks and such.

Yes, that's probably true, unless it showed a different result. But, indeed, seems very unlikely. If there was one, it didn't show a different result.
 
calinvass said:
To properly test a filter, I understand we can use a source of vertically polarized light. We send photon by photon say 1000 though a filter at, for example, 45 degrees the count the ones on the other side. We should get roughly 500, depending of the quality of the setup.
I was interested in a link to a paper that presents such an experiment.

http://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.121405
 
Thanks for the link.
Although they claim the source to be very efficient, I don't think such a source is absolutely necessary. However, it should work better.
A BBO crystal can be used I guess, to confirm every photon similarly to the setup in the Delayed Choice QE, by Kim et. al.
 

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