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My objective is to create a tabletop Bell test experimental setup generating data of suitable quality for undergraduate education or satisfaction of personal curiosity; remaining free from loopholes or pushing fidelity frontiers is not a concern.

As has been covered elsewhere you need to be able to emit & detect single photons in order to measure quantum phenomena. You can buy the single-photon double-slit experimental setup "in a box" from TeachSpin for about $9500, which uses (basically) a dim lightbulb behind a filter to generate few enough photons that only one photon is likely to be flying through the apparatus at any given time. However, I suspect this would not be good enough for Bell test where you need to correlate photon emission & detection. What is the minimal experimental setup necessary for a basic Bell test experiment, and approximately how much would it cost? Thousands? Tens of thousands?

The only heralded single-photon emitter I can find online costs $22,000 by itself, but I suspect that price is more a function of convenience, quality, and niche market. I would expect to have to build one myself through a laser, SPDC crystal, and detector. In a similar unanswered question a user claims in a comment that a basic working Bell test experiment can be conducted "for cheap" (presumably a few thousand dollars). Has anyone considered this problem?

A related question concerns the price of components giving specific capabilities but does not cover a full Bell test experimental setup.

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    $\begingroup$ I think you're going to want entangled photon pairs, not just single photons... $\endgroup$ Commented Nov 20, 2021 at 1:35
  • $\begingroup$ There is now an educational lab product claiming to demonstrate entanglement, but the price is only available by inquiry: qutools.com/qued $\endgroup$
    – ahelwer
    Commented Apr 5, 2022 at 15:22
  • $\begingroup$ @ahelwer have you inquired? What have you heard? ;) $\endgroup$
    – Cheng
    Commented Feb 7, 2023 at 9:21
  • $\begingroup$ @Cheng in the range of mid-\$10ks, up into the low \$100ks depending on what setup you want. $\endgroup$
    – ahelwer
    Commented Feb 7, 2023 at 14:10

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