It's an abbreviation of quod erat demonstrandum, which is the Latin translation of a Greek phrase meaning "which had to be proven". To the ancient Greeks, a proof wasn't complete unless the last sentence in your proof was basically the statement of the theorem. Putting QED after that sentence was their way of saying, "and that's what I was trying to prove, so there, I've proved it". We aren't ...
QED is short for the Latin phrase quod erat demonstrandum and means, loosely, "that which was to be shown". As noted in the comments, it's a summary way of saying that the proof is concluded.
Strong light–matter coupling has emerged as a transformative concept in modern physics, whereby the interaction between confined electromagnetic fields and material excitations is engineered to yield ...
Physicists are using quantum computers to simulate high-intensity electromagnetic interactions to test the limits of light and matter under extreme conditions.
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1719 May 6 (Gregorian calendar), [Daniel Defoe], The Life and Strange Surprizing Adventures of Robinson Crusoe, […], London: […] W[illiam] Taylor […], →OCLC, page 185: Such is the uneven State of human Life: And it afforded me a great many curious Speculations afterwards, when I had a little recovered my first surprise.