Quantum Physics2025-05-034 minarXiv:2505.01942Quantum Ghosts in the Hall of MirrorsIn quantum mechanics, some states defy intuition: their probability distributions dip into the negative, like mirages leaving only indirect clues.Jack Clarke·Pascal Neveu·Ewold Verhagen·Michael R. VannerSchwinger effectJulian SchwingerRainer WeissHendrik CasimirWigner functionsqueezed stateCasimir effectquantum tunnelingquantum decoherence👍👎☆SimplePopularAdvanced