This paper derives a complete theory of quantum measurement from the Informational Action Principle (IAP), using only the variational condition δSI = 0. Four main results are established. First, entanglement between two systems follows a universal timescale τ_ent = ℏ/(g√I_F^(1) I_F^(2)), showing that Fisher information controls how quickly correlations form. Second, measurement is identified as rapid entanglement with a macroscopic apparatus whose extremely high Fisher information leads to collapse-like behavior on 10⁻²¹–10⁻²⁴ s timescales. Third, the Born rule P(x) = |ψ|² is derived from dynamical self-consistency: probability conservation, gauge invariance, and the quantum potential enforce P = ρ. Fourth, decoherence naturally acquires Fisher dependence, giving γ_dec ∝ g² N_E k_B T I_F / ℏ² and linking the decoherence time to the thermodynamic relaxation time λ through λ = ln(d)·τ_dec. The theory produces several testable predictions for ion traps, cavity QED, superconducting circuits, and cold atoms, including Fisher scaling of entanglement rates and a characteristic τ_ent ∝ T^(-1/2) temperature dependence. Overall, the results unify quantum dynamics, measurement, and decoherence within a single information-theoretic variational framework.
This paper derives a complete theory of quantum measurement from the Informational Action Principle (IAP), using only the variational condition δSI = 0. Four main results are established. First, entanglement between two systems follows a universal timescale τ_ent = ℏ/(g√I_F^(1) I_F^(2)), showing that Fisher information controls how quickly correlations form. Second, measurement is identified as rapid entanglement with a macroscopic apparatus whose extremely high Fisher information leads to collapse-like behavior on 10⁻²¹–10⁻²⁴ s timescales. Third, the Born rule P(x) = |ψ|² is derived from dynamical self-consistency: probability conservation, gauge invariance, and the quantum potential enforce P = ρ. Fourth, decoherence naturally acquires Fisher dependence, giving γ_dec ∝ g² N_E k_B T I_F / ℏ² and linking the decoherence time to the thermodynamic relaxation time λ through λ = ln(d)·τ_dec. The theory produces several testable predictions for ion traps, cavity QED, superconducting circuits, and cold atoms, including Fisher scaling of entanglement rates and a characteristic τ_ent ∝ T^(-1/2) temperature dependence. Overall, the results unify quantum dynamics, measurement, and decoherence within a single information-theoretic variational framework.
We introduce the Quantum Consensus Principle (QCP), a first-principles framework that provides a purely dynamical derivation of the quantum measurement process without modifying the Schrödinger equation. By treating the apparatus–environment complex as an open quantum system, we show that measurement outcomes emerge from a thermodynamic selection process governed by large-deviation dynamics. Central to the theory is the derivation of a universal selection potential, Φᵢ, which is uniquely determined by the BKM information geometry of the thermal environment and linked to microscopic Hamiltonian parameters via Green–Kubo relations. We rigorously demonstrate that the conditioned system state follows a Hellinger-contractive supermartingale, converging almost surely to unique pointer states. Unlike standard postulates, QCP derives the Born rule as a specific neutrality limit and predicts measurable, apparatus-dependent deviations for non-ideal observers. Furthermore, the theory establishes a characteristic non-monotonic scaling of collapse timescales, providing a clear path for experimental falsification. This work bridges the gap between quantum information theory and non-equilibrium thermodynamics, identifying measurement as a fundamental consensus phenomenon in macroscopic systems.
We introduce the Quantum Consensus Principle (QCP), a first-principles framework that provides a dynamical derivation of quantum measurement within standard open-system quantum mechanics, without modifying the Schrödinger equation. By treating the system–apparatus–environment complex as an open quantum system, QCP derives measurement outcomes from a thermodynamic selection process governed by large-deviation dynamics. Central to the theory is a calibrated selection potential built from two canonical apparatus statistics, the redundancy rate and the noise susceptibility, defined in Bogoliubov–Kubo–Mori information geometry and linked to microscopic Hamiltonian parameters via Green–Kubo transport coefficients. Within the admissible class specified in the companion Supplement, the effective selector is unique up to affine gauge and takes a linear form in the canonical scores. In the Markovian pointer-preserving regime, the conditioned state process forms a Hellinger-type supermartingale and converges almost surely to unique pointer states. The Born rule is recovered as the exact trajectory-frequency law of the neutral instrument, while non-neutral calibrated instruments generate controlled POVM-level deviations. QCP further predicts a characteristic non-monotonic scaling of collapse timescales, providing a concrete route to experimental falsification. This work bridges quantum information theory and non-equilibrium thermodynamics by identifying measurement as a consensus phenomenon in macroscopic systems. Taken together, the main paper, Supplement, and companion notes establish the full physical and mathematical architecture of QCP.Unlike approaches that treat measurement primarily at the level of interpretation, QCP advances a unified operational program in which single-outcome selection, neutral-instrument Born recovery, apparatus-dependent deviations, and calibration from microscopic detector physics arise within one framework. Its significance therefore lies not only in proposing a collapse architecture, but in turning foundational claims into quantitative questions about response matrices, transport coefficients, and experimentally testable timescales. In this sense, QCP is designed to move the measurement problem from the level of competing narratives to the level of calibrated dynamical law.
We introduce the Quantum Consensus Principle (QCP), a first-principles framework that provides a dynamical derivation of quantum measurement within standard open-system quantum mechanics, without modifying the Schrödinger equation. By treating the system–apparatus–environment complex as an open quantum system, QCP derives measurement outcomes from a thermodynamic selection process governed by large-deviation dynamics. Central to the theory is a calibrated selection potential built from two canonical apparatus statistics, the redundancy rate and the noise susceptibility, defined in Bogoliubov–Kubo–Mori information geometry and linked to microscopic Hamiltonian parameters via Green–Kubo transport coefficients. Within the admissible class specified in the companion Supplement, the effective selector is unique up to affine gauge and takes a linear form in the canonical scores. In the Markovian pointer-preserving regime, bounded pointer-population martingales and the QND jump dynamics yield almost-sure finite-time selection of a unique pointer sector, with exact state collapse for rank-one pointer sectors. The Born rule is recovered as the exact trajectory-frequency law of the neutral instrument, while non-neutral calibrated instruments generate controlled POVM-level deviations. QCP further predicts a characteristic non-monotonic scaling of collapse timescales, providing a concrete route to experimental falsification. This work bridges quantum information theory and non-equilibrium thermodynamics by identifying measurement as a consensus phenomenon in macroscopic systems. Taken together, the main paper, Supplement, and companion notes establish the full physical and mathematical architecture of QCP. Unlike approaches that treat measurement primarily at the level of interpretation, QCP advances a unified operational program in which single-outcome selection, neutral-instrument Born recovery, apparatus-dependent deviations, and calibration from microscopic detector physics arise within one framework. Its significance therefore lies not only in proposing a collapse architecture, but in turning foundational claims into quantitative questions about response matrices, transport coefficients, and experimentally testable timescales. In this sense, QCP is designed to move the measurement problem from the level of competing narratives to the level of calibrated dynamical law.
Abstract We introduce the Quantum Consensus Principle (QCP), a first principles framework that provides a purely dynamical derivation of the quantum measurement process without modifying the Schrödinger equation. By treating the apparatus environment complex as an open quantum system, we show that measurement outcomes emerge from a thermodynamic selection process governed by large-deviation dynamics. Central to the theory is the derivation of a universal selection potential, Ф, which is uniquely determined by the BKM information geometry of the thermal environment and linked to microscopic Hamiltonian parameters via Green-Kubo relations. We rigorously demonstrate that the conditioned system state follows a Hellinger-contractive supermartingale, converging almost surely to unique pointer states. Unlike standard postulates, QCP derives the Born rule as a specific neutrality limit and predicts measurable, apparatus-dependent deviations for non-ideal observers. Furthermore, the theory establishes a characteristic non-monotonic scaling of collapse timescales, providing a clear path for experimental falsification. This work bridges the gap between quantum information theory and non-equilibrium thermodynamics, identifying measurement as a fundamental consensus phenomenon in macroscopi systems.
We introduce the Quantum Consensus Principle (QCP), a first-principles framework that provides a dynamical derivation of quantum measurement within standard open-system quantum mechanics, without modifying the Schrödinger equation. By treating the system–apparatus–environment complex as an open quantum system, QCP derives measurement outcomes from a thermodynamic selection process governed by large-deviation dynamics. Central to the theory is a calibrated selection potential built from two canonical apparatus statistics, the redundancy rate and the noise susceptibility, defined in Bogoliubov–Kubo–Mori information geometry and linked to microscopic Hamiltonian parameters via Green–Kubo transport coefficients. Within the admissible class specified in the companion Supplement, the effective selector is unique up to affine gauge and takes a linear form in the canonical scores. In the Markovian pointer-preserving regime, the conditioned state process forms a Hellinger-type supermartingale and converges almost surely to unique pointer states. The Born rule is recovered as the exact trajectory-frequency law of the neutral instrument, while non-neutral calibrated instruments generate controlled POVM-level deviations. QCP further predicts a characteristic non-monotonic scaling of collapse timescales, providing a concrete route to experimental falsification. This work bridges quantum information theory and non-equilibrium thermodynamics by identifying measurement as a consensus phenomenon in macroscopic systems. Taken together, the main paper, Supplement, and companion notes establish the full physical and mathematical architecture of QCP.
Abstract: The quantum measurement problem has been the deepest conceptual difficulty since the birth of quantum mechanics. Standard quantum mechanics accepts wavefunction collapse as an independent postulate but never provides a physical explanation. The decoherence approach attributes collapse to the interaction between the system and its environment, but faces two fundamental limitations: the “infinite regress” problem and the “insufficiency of decoherence” problem. Within the framework of the Self-Construction Theory (SCT), this paper provides a complete resolution of the measurement problem. The core thesis is that quantum measurement is not a fundamental process independent of the laws of physical evolution, but rather a local manifestation of constructive renormalization—the scale evolution of the spacetime complex field K from microscopic degrees of freedom to macroscopic effective descriptions. The origins of wavefunction collapse, decoherence, and the Born rule receive a unified first‑principles interpretation in this framework. SCT’s spontaneous decoherence mechanism is the key to the resolution. Constructive renormalization inherently involves information loss—the integrated‑out microscopic degrees of freedom no longer exist in the macroscopic effective description. During a measurement, the measuring apparatus possesses a huge number (∼1023) of microscopic degrees of freedom. When the apparatus interacts with the measured system, constructive renormalization triggers information compression of these degrees of freedom—the apparatus can no longer distinguish which branch of the superposition it is in, and quantum coherence is thus spontaneously lost. No “external environment” is needed—the constructive renormalization dynamics of spacetime itself is the ultimate source of decoherence, thereby completely solving the “infinite regress” problem. Among the probability distribution given by the Born rule, the weights of non‑maximal probability branches are further suppressed by information compression under the huge number of microscopic degrees of freedom, so that macroscopic observers can perceive only a definite outcome in the effective description. The information loss caused by constructive renormalization is ontological—it does not rely on any approximation or truncation, thus fundamentally solving the “insufficiency of decoherence” problem. The Born rule—that measurement outcomes occur with probabilities given by the squared amplitudes—is directly derived from the constructive integral structure in SCT. In the constructive renormalization limit, interference terms between different configurations are naturally suppressed by off‑diagonal phase randomization, and the system automatically switches to a classical probabilistic description. In the diagonal density matrix representation, the squared amplitude is the only natural weight that is simultaneously real and non‑negative. Hence the Born rule is not an additional postulate of quantum mechanics but a necessary and unique manifestation of the relative frequencies of the constructive integral in the constructive renormalization limit. This derivation is rigorous within the mathematical framework of constructive renormalization—it does not rely on any approximations or truncations. SCT’s quantum measurement theory is deeply unified with the black hole information paradox. The “collapse” in quantum measurement and the “information loss” in black hole evaporation are different manifestations of the same core mechanism—the redistribution of information due to constructive renormalization—in two extreme physical situations. In quantum measurement, information is redistributed into the degrees of freedom of the macroscopic apparatus; in black hole evaporation, information is redistributed into the time‑point configurations on the horizon. This unification is the strongest proof of the universality of constructive renormalization as an information‑processing mechanism. Keywords: quantum measurement; spontaneous decoherence; constructive renormalization; Born rule; wavefunction collapse; information redistribution; Self-Construction Theory