  Coherence and tunneling play central roles in quantum phenomena. In a
tunneling event, the time that a particle spends inside the barrier has been
fiercely debated. This problem becomes more complex when tunneling repeatedly
occurs back and forth, and when involving many particles. Here we report the
measurement of the coherence time of various charge states tunneling in a
nanowire-based tunable Josephson junction; including single charges, multiple
charges, and Cooper pairs. We studied all the charge tunneling processes using
Landau-Zener-St\"uckelberg-Majorana (LZSM) interferometry, and observed
high-quality interference patterns. In particular, the coherence time of the
charge states was extracted from the interference fringes in Fourier space. In
addition, our measurements show the break-up of Cooper pairs, from a
macroscopic quantum coherent state to individual particle states. Besides the
fundamental research interest, our results also establish LZSM interferometry
as a powerful technique to explore the coherence time of charges in hybrid
devices.
