Haroche and his colleagues demonstrate the quantum superposition of macroscopic quantum states — also known as Schrödinger cat states — using photons that interact with highly excited atoms inside of a cavity. With a similar experimental setup, the team later observes the effect of quantum decoherence, a process that lies at the heart of quantum measurements.
What Haroche do is keep a photon in a box and scientist can research it:
More work about Serge Haroche’s work:
