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In the "Quantum physical background" paragraph, where is the Figure 1 to which it refers? There is a Figure 1 much farther down (in "Representation of squeezed states...") that doesn't appear to me to apply to this earlier reference. 24.16.12.134 (talk) 19:29, 24 October 2023 (UTC)[reply]
The missing figure, which I remember clearly, was actually in five parts - Fig. 1a-e. (Fig. 1f still appears.) Its disappearance represents a huge loss from this otherwise fine article. I hope that it can be recovered and reintroduced. This disruption also makes me think that I need to do a print-to-PDF far more often when I find a truly essential Wikipedia article, which this article was before this significant loss 67.170.37.204 (talk) 11:14, 30 October 2023 (UTC)[reply]
I have now confirmed that the missing figures(s) can be consulted (for now) via the Wayback Machine of the Internet Archive, in the July 2023 capture 67.170.37.204 (talk) 17:21, 16 November 2023 (UTC)[reply]
The figure is still visible in this old version [[1]] of the article. The subsequent chain of events leading to its loss is comical:
On 17 August, the user @ASUDLER uploaded a new image (probably to fix the spelling of "vacuum")
On 5 September at 05:37, the user @krd (possibly a bot) deleted the new uploaded image because "No licence since 28 August 2023". This is a real pity: given that the image was (I'm guessing) a small tweak of the previous image, it should have been obvious that the missing licence was a small administrative hiccup that could have been resolved without deleting the image.
On 5 September at 05:53, just 16 minutes after the previous event, the @CommonsDelinker bot deleted the image link from this article. This too is a pity: a human would have taken the time to investigate why the link was broken, and then either restored the old image (despite the spelling mistake) or uploaded a new version with the corrected spelling and a valid licence.
While I have the highest respect for the valuable work that users/bots like @krd and @CommonsDelinker perform, I hope they can find a way to change their algorithms/procedures to avoid mishaps like this in the future. In the meantime, I hope somebody with better wikipedia proficiency than me can restore the image from the old version (see link above).
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