The measurement problem of quantum theory remains unresolved in terms of how the quantum state of the physical world can be reduced to an observed state of the world. In the conventional formulation of quantum theory, the quantum state of the physical world is understood as an unobserved state of potentiality or a quantum wavefunction that must collapse into an observed state of actuality for the physical world to actually be observed. The unresolved issue of the quantum measurement problem is about the true nature of the observer. This question about the true nature of the observer explodes when we understand the quantum state of the physical world in terms of the holographic principle of quantum gravity, which tells us the fundamental nature of the physical world is quantized bits of information, called qubits, encoded on a holographic screen. The holographic screen in turn can be understood as an event horizon that arises in an observer's accelerated frame of reference. This way of understanding the holographic principle can be understood in terms of matrix models that utilize non-commutative geometry. The holographic principle understood in the context of an observer in an accelerated frame of reference has something important to tell us about the true nature of the observer, which is that every observer is at the center of its own holographic screen that defines its own observable holographic world.
The measurement problem of quantum theory remains unresolved in terms of how the quantum state of the physical world can be reduced to an observed state of the world. In the conventional formulation of quantum theory, the quantum state of the physical world is understood as an unobserved state of potentiality or a quantum wavefunction that must collapse into an observed state of actuality for the physical world to actually be observed. The unresolved issue of the quantum measurement problem is about the true nature of the observer. This question about the true nature of the observer explodes when we understand the quantum state of the physical world in terms of the holographic principle of quantum gravity, which tells us the fundamental nature of the physical world is quantized bits of information, called qubits, encoded on a holographic screen. The holographic screen in turn can be understood as an event horizon that arises in an observer's accelerated frame of reference. This way of understanding the holographic principle can be understood in terms of matrix models that utilize non-commutative geometry. The holographic principle understood in the context of an observer in an accelerated frame of reference has something important to tell us about the true nature of the observer, which is that every observer is at the center of its own holographic screen that defines its own observable holographic world.
The measurement problem in physics remains an unresolved challenge characterized by significant conceptual complexity. Paradoxically, mainstream scientific discourse has often sidestepped this issue by invoking processes such as the 'collapse of the wavefunction'—a mechanism that, to this day, lacks a rigorous definition. This framework has primarily served as a pragmatic way to bypass the problem, allowing the inherent subjectivity introduced by the observer to be overlooked. In this article, I aim to provide a detailed exposition of the measurement problem and trace its underlying causes. A case will be made for integrating perspectives from the Philosophy of Science to address this issue systematically. Furthermore, I will explore the critical necessity of developing a robust theory of consciousness, which may provide deeper insights into the measurement problem. By investigating the foundational principles of such a theory, this work seeks to illuminate the intricate relationship between Quantum Theory and Consciousness, potentially offering a more unified understanding of these fundamental phenomena.
The quantum measurement problem remains a central unresolved issue in theoretical physics, arising from the incompatibility between unitary quantum dynamics and the emergence of definite measurement outcomes. Closely related is the question of the physical status of the wavefunction within contemporary quantum theory. This review critically surveys leading approaches to the measurement problem, focusing on their formal consistency, physical assumptions, and empirical implications. We examine the standard measurement framework, the role of environment-induced decoherence and quantum Darwinism, and the restrictions imposed by no-go theorems such as Bell, Kochen–Specker, and Pusey–Barrett–Rudolph. Interpretations including Everettian many-worlds, Bohmian mechanics, spontaneous collapse models, relational quantum mechanics, QBist approaches, and Copenhagen-type frameworks are assessed in terms of their ability to account for classical definiteness without sacrificing empirical adequacy. We also review experimental efforts probing macroscopic superpositions and collapse dynamics. The analysis indicates that, despite its predictive success, quantum theory lacks a complete physical account of outcome selection. This suggests that the measurement problem reflects a fundamental structural limitation of current theory, motivating either new physical principles or a redefinition of the wavefunction’s ontological role.
Quantum theory (QT) treats of “observables” yet the term “observer” remains hardly a rigorous notion. We argue that the uncertainty principle of QT can be understood in the Godel sense that: any given observer constitutes own practical definition of “the unobservable” (if superposition) namely length scale, phase space, non-local action, fundamental frequency etc. Conversely, the observable is definable strictly only in inverse-observer terms as, that is, the “collapse” namely inverse-length, phase-points, locality, harmonics respectively. Granted this picture is not a-priori intuitive we show that it resolves key modern difficulties plus it has formal grounds. One pictures the observer thus in the manner of Godel’s “consistency-is-undecidable” or Planck’s “the-constant-is-uncertainty” or indeed Einstein’s “speed-of-light-is-null-information” etc. definitive of which three cases, we assert, is Peano’s (and Noether’s?) notion of the constant as being for any gamut of variables/symmetry the meta-state (“conserved current”?). Given then that the observer is in any scheme of events the invariance (constant) it should be the case that it is the observer proper and not his observables which should constitute the violation of Bell’s inequality—if as the infinitesimal/imaginary axis or as the dimensionless/infinite-dimensional or the so-called conservation law etc. We posit: the observer is by definition the virtual exchange (field) of standard model or “space-time” of GR or just the “metric”—defined by the singular trait that it is the de facto universal constant i.e. the natural unit and hence natural limit of physical information. As a prediction we show herein an exact value to define man (perhaps our purest sample of observer) as also the natural unit for quantum gravity. Ultimately, that known hitherto as the potential (conservation law) becomes here same exactly as the “mind” or the “life” i.e. strictly put: “the-observer-as-the-unobservable” (superposition).The observer is for us per se the “entity”—in the sense of “phase-space” (normal mode; fundamental; wave speed) giving us an intuitive picture of observables that is same in fact as Huygens’ wave fronts/wavelets (or Everett’s many-worlds, or indeed Darwin’s evolution/speciation of “life”) same in short as any “spontaneous symmetry breaking”.
I. The arena of quantum mechanics and quantum field theory is the abstract, unobserved and unobservable, M-dimensional formal Hilbert space ≠ spacetime. II. The arena of observations—and, more generally, of all events (i.e., everything) in the real physical world—is the classical four-dimensional physical spacetime. III. The “Born rule” is the random process “magically” transforming I into II. Wavefunctions are superposed and entangled only in the abstract space I, never in spacetime II. Attempted formulations of quantum theory directly in real physical spacetime actually constitute examples of “locally real” theories, as defined by Clauser and Horne, and are therefore already empirically refuted by the numerous tests of Bell’s theorem in real, controlled experiments in laboratories here on Earth. Observed quantum entities (i.e., events) are never superposed or entangled as they: (1) exclusively “live” (manifest) in real physical spacetime and (2) are not described by entangled wavefunctions after “measurement” effectuated by III. When separated and treated correctly in this way, a number of fundamental problems and “paradoxes” of quantum theory vs. relativity (i.e., spacetime) simply vanish, such as the black hole information paradox, the infinite zero-point energy of quantum field theory and the quantization of general relativity.
A conceptual difficulty in the foundations of quantum mechanics is the quantum measurement problem (QMP), essentially concerned with the apparent non-unitarity of the measurement process and the classicality of macroscopic systems. In an information theoretic approach proposed by us earlier (Quantum Information Processing 2, 153, 2003), which we clarify and elaborate here, QMP is understood to signal a fundamental finite resolution of quantum states, or, equivalently, a discreteness of Hilbert space. This was motivated by the notion that physical reality is a manifestation of information stored and discrete computations performed at a deeper, sub-physical layer. This model entails that states of sufficiently complex, entangled systems will be unresolvable, or, {\em computationally unstable}. Wavefunction collapse is postulated as an error preventive response to such computational instability. In effect, sufficiently complex systems turn classical because of the finiteness of the computational resources available to the physical universe. We show that this model forms a reasonable complement to decoherence for resolving QMP, both in respect of the problem of definite outcomes and of the preferred basis problem. The model suggests that QMP, as a window on the sub-physical universe, serves as a witness to Wheeler's koan ``it from bit''. Some implications for quantum computation and quantum gravity are examined.
QBism explicitly takes the subjective view: probabilities of events are defined solely by past experiences, i.e. the record of observations. As shown by the authors (Fuchs et al, 2013), this: “... removes the paradoxes, conundra, and pseudo-problems that have plagued quantum foundations for the past nine decades”. It is criticised for its lack of ontology and anthropocentric nature. However, if Everett's (1957) formulation is taken at face value, exactly the features of QBism are the result, and the ontology is inherent. The anthropocentric nature of the solution is simply an indication that the quantum state is relative, as is central to Everett. Problems of measurement and locality do not arise. As described by Tegmark (1997), Everett defines the relationship between two fundamentally different views of the world, different types of frame of reference. The outside view is defined by the unitary wave function, the inside view by the record of observations. As Lockwood (1989) states, the preferred basis problem is fully resolved if the latter is taken as the basis. Taken literally, only that defined by the record of observations is determinate in the physical world of this inside view. The reality of QBism is the result. The same can be derived from first principles in the no-collapse universe. Taking the outside view to define all possible decoherent quasi-classical worlds, the physical world of the inside view is the superposition of all such worlds in which it is instantiated. In this quantum mechanical frame of reference only that observed is determinate. The quantum state as ontology is questioned because it defines only the linear dynamics and cannot account for collapse. No deeper reality is required, however: the inside view, and the collapse dynamics that operates in this type of frame of reference, are emergent properties of the system, and operate at a different level of logical type. The world operates as described by QBism, but is nonetheless defined by the quantum state.