Schrodinger points out that we can wait as long as we like before “observing” the inside of the box, and that we cannot believe that there is really a superimposed state of “cat alive” and “cat dead” during all that time. (In practice, it is hard to keep a macroscopic object in a definite quantum state for a long time: h is so small that very tiny disturbances move it to a different quantum state, which then evolves away to a very different state rather quickly). There followed fifty years of argument about how we should “interpret” this. More interesting is the idea of applying this physical phenomenon.
Schrodinger points out that we can wait as long as we like before “observing” the inside of the box, and that we cannot believe that there is really a superimposed state of “cat alive” and “cat dead” during all that time. (In practice, it is hard to keep a macroscopic object in a definite quantum state for a long time: h is so small that very tiny disturbances move it to a different quantum state, which then evolves away to a very different state rather quickly). There followed fifty years of argument about how we should “interpret” this. More interesting is the idea of applying this physical phenomenon.