Schrödinger's Cat

Paradoxical thought experiment demonstrating quantum superposition.

Proposed by Erwin Schrödinger in 1935 to expose the absurdity of applying superposition to everyday objects.
The cat is described as simultaneously alive and dead until observation collapses the wavefunction.
Laboratory 'cat states' have been created in trapped ions, microwave cavities, and a 16-microgram vibrating crystal in 2023.