Quantum Physics2026-01-272 minarXiv:2601.19356expressA Clock Without Extra HandsA tuning fork rings at a single note, but soft overtones, multiples of the frequency that mix with the fundamental, are always present.Si-Qi Chen·Qi-Tao Duan·Teng Li·He LuErwin SchrödingerLudwig Boltzmannharmonic oscillatorquantum sensing👍👎☆SimplePopularAdvanced