quantum-computer
Explanation
This comic plays on the double meaning of the word "quantum." In physics, "quantum" refers to the smallest discrete unit of any physical property, and quantum computers use quantum mechanical phenomena for computation. But the seller in this comic uses "quantum" in its older, more literal Latin sense -- simply meaning "a quantity" or "an amount."
So when the buyer purchased a "quantum computer," they thought they were getting a cutting-edge quantum computing device, but the seller just meant it was "a discrete quantity of computers" -- literally just a regular computer, or perhaps a small number of them. The seller refuses to give a refund. The caption notes it was "surprisingly easy to get $100 million from NASA," implying this was a large-scale scam exploiting the hype around quantum computing. The joke satirizes both the overhyped tech buzzword "quantum" and the gullibility of institutions throwing money at trendy scientific concepts they don't fully understand.