Schrödinger's Cat Experiment

‘Schrödinger's Cat’ is a thought experiment created by Austrian physicist Erwin Schrödinger (1935) to illustrate the problem of the Copenhagen interpretation of quantum mechanics applied to everyday objects.  Schrödinger coined the term Verschränkung (entanglement).

The imaginary experiment begins with a cat placed in a sealed box with 1) a flask of poison, 2) a radioactive source.  The flask of poison can be can be broken by a hammer connected to a Geiger counter radiation detector controller.  The cat might be alive or dead, depending on an earlier random event.

The Copenhagen interpretation of quantum mechanics implies that after a while, the cat is simultaneously alive and dead. Yet, when we look in the box, we see the cat either alive or dead, not both alive and dead.