The problem of Schrödinger’s Cat has figured prominently in the debates about the bearing of quantum physics on our understanding of physical reality. On its basis, various theorists have maintained the quantum physical world exhibits a probabilistically indecisive physical reality. The analysis of the paper that this appeal to quantum reality is methodologically at odds with and disjoint from its underlying approach to quantum theory itself. If there is to be methodological uniformity at this juncture it will have to be along the lines that Einstein always focused—an incomplete hidden factor (perhaps better than “hidden variables”) approach.
The problem of Schrödinger’s Cat has figured prominently in the debates about the bearing of quantum physics on our understanding of physical reality. On its basis, various theorists have maintained the quantum physical world exhibits a probabilistically indecisive physical reality. The analysis of the paper that this appeal to quantum reality is methodologically at odds with and disjoint from its underlying approach to quantum theory itself. If there is to be methodological uniformity at this juncture it will have to be along the lines that Einstein always focused—an incomplete hidden factor (perhaps better than “hidden variables”) approach.
The most discussed of ``live'' metaphors in physical sciences is that of the Schrödinger cat. Introduced in the early, but mature days of the new quantum theory, in 1935, the parable of the cat has provoked and enlivened debates on the meaning of the quantum theory, on the ontology of the quantum wavefunction, on the puzzle of the collapse of the wavefunction, on the meaning of quantum measurement, and on the boundary between the quantum world and the classical world. In this article, I will discuss these issues of the quantum theory focussing on various aspects of the metaphor of the Schrödinger cat.
Quantum physics confronts contemporary metaphysicians with a fascinating and frustrating puzzle. It appears to be telling us something novel and surprising about the nature of the physical world, but it is hard to pin down exactly what it tells us. Hidden variable theories constitute a second major class of solutions to the measurement problem. They differ from the standard theory and spontaneous collapse theories in eschewing collapse altogether; according to hidden variable theories, the wavefunction always evolves according to the Schrodinger equation. The simplest and most radical response to the measurement problem is to assert that standard quantum mechanics without wavefunction collapse constitutes a complete physical theory. The many worlds theory is more flexible in this regard; according to the standard contemporary version, no presupposition is made concerning precisely which physical properties form the basis of measurement results. There are several approaches to quantum mechanics, any or none of which might yield an acceptable physical theory.
Earlier in this century, the physics community was wracked with a great debate between the determinists and the indeterminists over the status of quantum theory. Determinists like Einstein and Bohm argued that quantum theory would eventually be superseded by a deterministic theory having new state variables. Indeterminists like Heisenberg and Schrodinger, speaking for the Copenhagen School, disagreed. They maintained that the indeterminism in quantum theory was not merely a temporary setback, an epistemological problem to be overcome by means of a better scientific theory, but an accurate ontological representation of the matter.
Quantum mechanics is our most successful physical theory. It underlies our very detailed understanding of atomic physics, chemistry, and nuclear physics, and the many technologies to which physical systems in these regimes give rise. Additionally, relativistic quantum mechanics is the basis for the standard model of elementary particles, which very successfully gives a partial unification of the forces operating at the atomic, nuclear, and subnuclear levels. However, from its inception the probabilistic nature of quantum mechanics, and the fact that “quantum measurements” in the orthodox formulation appear to require the intervention of non-quantum mechanical “classical systems,” have led to speculations by many physicists, mathematicians, and philosophers of science that quantum mechanics may be incomplete. Among the Founding Fathers of quantum theory, Einstein and Schrödinger were both of the opinion that quantum mechanics is in some way unsatisfactory, and this view has been amplified in more recent profound work of John Bell, among others. In an opposing camp, many others in the physics, mathematics, and philosophy communities have attempted to provide an interpretational foundation in which quantum mechanics remains a complete and self-contained system. Among the Founding Fathers, Bohr, Born, and Heisenberg maintained that quantum mechanics is a complete system, and a number of recent proposals have been made to improve upon or to provide alternatives to their “Copenhagen Interpretation.” The debate continues, and has spawned an enormous literature.
Both at formal and philosophical levels, decades of efforts have been devoted to a deciphering of the `quantum enigma', the `crazy way quantum objects behave', to quote R.P. Feynman's words. We posit that the enigma cannot recede without resorting to a thorough questioning of the quantum ontology. In the current paper this questioning is introduced through a revisitation of the famous Schrödinger's cat paradox, and of the main attempts at solving it. Our proposal thereof, is that the quantum world enjoys a sound physical reality (complying, in particular, with the scientifc requirement of experimental reproducibility), but also, that this physical reality calls for an enlarged, and however precise notion of `what is real', such that what is real and actual can be distinguished from what is real but potential
Schrödinger's cat paradox has persisted for nearly a century as a demonstration of the apparent absurdity of quantum superposition when extended to macroscopic scales. This technical note demonstrates that the paradox dissolves entirely within the CAT'S Theory framework through the triadic invariant Reality = Pattern × Intent × Presence (P × I × Pr). We argue that the cat is neither "both alive and dead" nor the victim of mysterious collapse. Instead, superposition represents a state where Presence (Pr) has not yet instantiated, yielding P × I × 0 = 0 (potential but not actual). Measurement does not "cause" collapse through mysterious observer effects; it provides the Presence component required for actualization. This resolution eliminates the need for Multiple Worlds or hidden variables while maintaining consistency with quantum mechanical predictions.