What the thought experiment actually says
In the parable, a cat, a flask of poison, and a radioactive source are sealed in a box. If radioactivity is detected, the poison is released and the cat dies; if not, the cat lives. Until someone looks into the box, the standard quantum description treats the radioactive source as being in a superposition of decayed and not-decayed, which seems to leave the cat in a superposition of dead and alive [4]. Only after opening the box, the story goes, can one identify either an alive or a dead cat [4].
The point is not that cats can be undead. The thought experiment is an iconic example of the problem of the transition from the microscopic quantum world to the macroscopic, classical one [3]. It asks up to which system size quantum effects can be expected, and how the transition between the classical and the quantum world can be characterized [3].
Why the paradox feels unresolvable
The usual telling says a system exists in multiple states simultaneously until it is observed. But that interpretation introduces a metaphysical contradiction that doesn't resolve; it loops [5]. One proposed resolution argues that collapse does not occur at the moment of observation. Instead, it occurs when a system can no longer maintain recursive tension—the cat is not both alive and dead, but the system is simply unresolved until it collapses under constraint [5].
A different line of work argues that the classical state of the cat is not determined by the external observer's looking, but is spontaneously completed by an internal self-stabilization mechanism initiated by the system itself before the observer intervenes, repairing a structural fracture at the micro-macro interface [2]. That proposal is presented as a structural answer to the measurement problem without introducing the collapse postulate or many-world branches [2]. These are proposed frameworks, not settled experimental facts.
What research on macroscopic quantum states adds
The field of macroscopicity aims to answer how large a system can be while still showing quantum effects, both theoretically and experimentally [3]. It includes macroscopicity measures, experimental realizations, and links to metrology, and it offers pedagogical visualizations and a hands-on activity where students build their own macroscopic quantum cats from cardboard cells that are in a superposition of being dead and alive [3]. That activity is a teaching tool for the concept of superposition, not a demonstration that a real cat can be in two states at once.
The cat as a metaphor elsewhere
The image travels beyond physics. A legal analysis of Brazil's constitutional claim landscape compares the state of that doctrine to Schrödinger's cat—alive-dead—to capture an unresolved, dual status [1]. A medical commentary uses the same parable to describe uncertainty in identifying which Bartonella species causes endocarditis: without molecular testing, the species may be B henselae or B quintana (or another), and may or may not be linked to a cat [4]. In both cases the phrase signals unresolved ambiguity, not a literal quantum superposition.
Sources used in this answer
THE “STATE OF THE ART” OF THE CLAIM IN THE STF AND STJ:IS SCHRÖDINGER'S CAT ALIVE-DEAD?
The paper uses Schrödinger's cat as a metaphor to describe the unresolved, alive-dead state of the constitutional claim in Brazilian courts.
Reconstruction of Schrödinger's Cat in Many Worlds 1; Six Interpretations on Whether Schrödinger's Cat Is Dead or Alive
The paper presents six mathematical-physical frameworks arguing that macroscopic systems cannot maintain quantum superpositions and that the cat's classical state is spontaneously completed by an internal self-stabilization mechanism before observation.
How many lives does Schrödinger’s cat have?
The paper explains macroscopicity—how large a system can be while still showing quantum effects—and provides a hands-on activity where students build cardboard cats in a superposition of dead and alive.
Schrödinger's Cat Paradox: <i>Bartonella</i> Serology Cannot Be Used to Speciate <i>Bartonella</i> Endocarditis
The paper uses Schrödinger's cat as an analogy for uncertainty in identifying Bartonella species causing endocarditis when molecular testing is not performed.
The Misunderstanding of Schrödinger's Cat
The paper argues that the common interpretation of the cat as both alive and dead is a misunderstanding, and proposes that collapse occurs when a system can no longer maintain recursive tension rather than at the moment of observation.