Abstract
The interference is an intrinsic feature of waves. In the quantum world, a variety of interferometric measurements of matter waves have so far been performed to demonstrate the wave-particle duality. In this short note, we review such quantum interferometric measurements of wave packets (WP's) in atoms and molecules such as Rydberg WP's in atoms and vibrational WP's in molecules. We also show the results of our recent WP interferometry with the iodine molecules, which have been performed by phase-locking a pair of femtosecond laser pulses on the attosecond time scale.
