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arXiv:hep-ph/9705227 · Journal of Physics A Mathematical and General

Tests of basic quantum mechanics in oscillation experiments

G. Domokos, Susan Kovesi-Domokos

Published Jan 1, 1999• 10 citations
arXivHTMLPDF

Abstract

According to standard quantum theory, the time evolution operator of a quantum system is independent of the state of the system. One can, however, consider systems in which this is not the case: the evolution operator may depend on the density operator itself. The presence of such modifications of quantum theory can be tested in long-baseline oscillation experiments.

DOI
10.1088/0305-4470/32/22/311

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Model-independent tests of quantum theory, such as Bell inequality violations, focus on static properties of the theory and do not rely on its dynamical aspects. Hence, this core part of quantum theory remains largely untested in a model-independent way. We show that the structure of quantum time evolution can be examined by testing the consistency between the state space and the dynamical laws. Considering a class of generalized phase-space theories, we find that certain quantum states can only be part of a theory if the time evolution is quantum: their evolution in anharmonic potentials would otherwise result in unphysical, negative marginal distributions. Furthermore, we demonstrate that the existence of the first excited state of a quantum harmonic oscillator is already sufficient to single out the Moyal bracket (quantum dynamics) to leading order in $\hbar^2$. We outline how theory-independent Wigner tomography of this state can be used to empirically exclude nonquantum dynamical theories.

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The time-dependent Schrödinger equation forms the chapter's starting point. For a time-independent Hamiltonian, a quantum state may be time evolved with the standard, unitary time evolution operator. After obtaining this operator, an algorithm is provided by which a state may be time evolved, and measurement probabilities determined. A spin 1/2 example illustrates time evolution concretely. All this makes close contact with the discussion of unitary operators in Chapter 10. The time dependence of expectation values forms the next topic, followed by the concept of a constant of the motion, which is carefully contrasted with that of a stationary state. The energy-time uncertainty relations, which rest on a quite different conceptual footing than the ‘standard’ uncertainty relations, occupy the rest of the chapter. An example from spin 1/2 illustrates the energy-time uncertainty relations.

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Abstract This chapter begins the discussion of the time evolution of an active quantum system. From the earlier chapters, time dependent physics has been observed through the presence of the time evolution of the phase of each eigenstate. The Hamiltonian itself is time independent. This represents the same kind of evolution of a classical system like the vibration of a tuning fork when it has been struck or the oscillation of an LC circuit if the capacitor is charged to some voltage and then the switch is closed. In the quantum case, the Hamiltonian has also been time independent. The time evolution evolves according the full-time dependent Schrödinger equation, depending only on a single initial condition of the state vector or wave function and the corresponding time evolution of the phase factor for each eigenstate. However in this chapter, we consider the case of when there is a time dependent Hamiltonian such as a sinewave generator or laser. As in the case of resonant tunneling, we see the importance in dynamics of resonant coupling. With an oscillating potential energy term, we see the presence of Rabi oscillations in the probability amplitude of a two-state system on resonance, which can be viewed as a quantum flip-flop between two states of a quantum bit (qubit).

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Stochastic collapse and decoherence of a non-dissipative forced harmonic oscillator

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Careful monitoring of harmonically bound (or as a limiting case, free) masses is the basis of current and future gravitational wave detectors, and of nanomechanical devices designed to access the quantum regime. We analyze the effects of stochastic localization models for state vector reduction, and of related models for environmental decoherence, on such systems, focusing our analysis on the non-dissipative forced harmonic oscillator, and its free mass limit. We derive an explicit formula for the time evolution of the expectation of a general operator in the presence of stochastic reduction or environmentally induced decoherence, for both the non-dissipative harmonic oscillator and the free mass. In the case of the oscillator, we also give a formula for the time evolution of the matrix element of the stochastic expectation density matrix between general coherent states. We show that the stochastic expectation of the variance of a Hermitian operator in any unraveling of the stochastic process is bounded by the variance computed from the stochastic expectation of the density matrix, and we develop a formal perturbation theory for calculating expectation values of operators within any unraveling. Applying our results to current gravitational wave interferometer detectors and nanomechanical systems, we conclude that the deviations from quantum mechanics predicted by the continuous spontaneous localization (CSL) model of state vector reduction are at least five orders of magnitude below the relevant standard quantum limits for these experiments. The proposed LISA gravitational wave detector will be two orders of magnitude away from the capability of observing an effect.

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A theorem about time evolution in the quantum mechanics

M. A. Rajabpour

Under broad conditions, we prove that the probability amplitudes in the quantum mechanics are either always constant in time or changing continuously in any interval of time.

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A Modular Time-Dynamics Framework Combining Relativistic Physics with the Proposed VFE1 and QCC0 Formalisms

Donald Smith

A Modular Time-Dynamics Framework Combining Relativistic Physics with the Proposed VFE1 and QCC0 Formalisms Abstract We propose a modular computational framework for investigating time evolution across relativistic, quantum, and geometric regimes. The framework separates established physical models from two proposed components: Vibrational Field Equation One (VFE1), intended to describe an additional field-dependent contribution to temporal evolution, and Quantum Computerization Consciousness Zero (QCC0), introduced as a quantitative measure of quantum-state correlation and computational coherence within the model. The framework does not replace established relativity or quantum mechanics. Instead, special relativity, general relativity, and conventional quantum-mechanical descriptions provide the reference layer against which the proposed VFE1 and QCC0 formulations can be evaluated. The Kapnack Solver provides the numerical engine, while the 369 vortex formulation is treated as a proposed geometric/kinematic transformation layer within the broader SDKP architecture. The central objective is falsifiable comparison: for a specified physical system, the framework calculates the prediction obtained from established physics, calculates the corresponding prediction obtained after inclusion of the proposed VFE1/QCC0 terms, and compares both predictions with independently measured data. Any improvement must be demonstrated quantitatively and must survive independent reproduction. 1. Introduction Time is a fundamental parameter in modern physics, but its operational behavior depends upon the physical state and reference frame of the system under consideration. In special relativity, proper time depends upon relative motion. For an inertial observer, the differential relation between proper time and coordinate time is [d\tau = dt\sqrt{1-\frac{v^2}{c^2}},] where (v) is relative velocity and (c) is the invariant speed of light. In general relativity, spacetime geometry is determined by the gravitational field, and the proper time measured by a clock depends upon its worldline through spacetime. In the weak-field limit, gravitational time dilation can be approximated by the corresponding metric or gravitational-potential correction. Quantum mechanics introduces a separate description of physical evolution in which states evolve according to a dynamical equation such as [ i\hbar\frac{\partial}{\partial t}\left|\psi(t)\right\rangle \hat{H}\left|\psi(t)\right\rangle .] These established theories provide the reference framework for the present proposal. The purpose of the present work is to investigate whether additional geometric, density, kinetic, positional, or field-state variables can provide useful predictive information beyond the standard reference calculations. Within the proposed SDKP architecture, these additional variables are organized through the Scale-Density-Kinetic/kinematic framework and associated computational methods. Two components are particularly relevant to temporal modeling: Vibrational Field Equation One (VFE1) — a proposed field-based temporal correction or extension. Quantum Computerization Consciousness Zero (QCC0) — a proposed quantitative descriptor of quantum correlation/coherence within the computational representation. Both are treated here as hypotheses requiring empirical validation rather than as established physical laws. 2. Established Physical Baseline 2.1 Special Relativity The first reference model is special-relativistic proper time. For motion at constant velocity, [d\tau =dt\sqrt{1-\frac{v^2}{c^2}}.] Integration gives [\Delta\tau =\Delta t\sqrt{1-\frac{v^2}{c^2}}] for constant (v). This relationship provides an experimentally established baseline for evaluating any proposed modification to velocity-dependent temporal evolution. The framework therefore requires the relativistic calculation to remain available independently of VFE1 and QCC0. 2.2 General Relativity For gravitational systems, the reference calculation is obtained from the spacetime metric [ds^2 = g_{\mu\nu}dx^\mu dx^\nu .] For a timelike trajectory, [d\tau^2 =-\frac{ds^2}{c^2}] under the appropriate metric-signature convention. Thus, gravitational time dilation is not introduced as an independent assumption of the proposed framework. It is calculated from the established spacetime geometry. In weak gravitational fields, the resulting prediction may be expressed approximately in terms of gravitational potential and velocity. These established predictions constitute the baseline against which the proposed VFE1 contribution is tested. 3. Proposed SDKP Temporal Representation The proposed SDKP architecture introduces a state representation containing geometric scale, density, kinetic state, and position: [\Psi =(S,\rho,K,P).] Here, (S) represents structural or geometric scale, (\rho) represents a density or density distribution, (K) represents kinetic state, (P) represents spatial position. The important distinction is that these quantities are treated as model variables rather than being assumed automatically to constitute new physical laws. The computational objective is therefore to determine whether an appropriate transformation [\Psi\longrightarrowT] can reproduce known temporal behavior and, more importantly, whether it produces independently testable predictions that improve upon established models. 4. Vibrational Field Equation One (VFE1) VFE1 is proposed as a field-dependent extension of temporal dynamics. The general form may be represented as [ \mathcal{T}_{\mathrm{VFE1}} \mathcal{F}\left(S,\rho,K,P,\Phi_v\right),] where (\Phi_v) represents the proposed vibrational-field state. The precise functional form of (\mathcal{F}) must be specified for each physical application and must not be selected solely to reproduce an existing observation. A useful formulation is therefore to decompose the prediction into a standard component and an additional VFE1 contribution: [ T_{\mathrm{model}} T_{\mathrm{standard}}+\Delta T_{\mathrm{VFE1}}.] The term [\Delta T_{\mathrm{VFE1}}] is the quantity that must be independently constrained. This construction has an important scientific advantage: the VFE1 hypothesis can be falsified. If [\Delta T_{\mathrm{VFE1}} \rightarrow 0] is consistently required by experimental data, then VFE1 provides no experimentally distinguishable temporal correction in that regime. Conversely, if a nonzero correction is predicted before measurement and is subsequently observed, the result provides evidence requiring further investigation. 5. Quantum Computerization Consciousness Zero (QCC0) QCC0 is proposed as a computational quantity associated with the representation of quantum-state correlation, coherence, or information consistency. For a quantum state described by density operator (\rho_q), established quantum mechanics provides quantities such as purity, [ \mathcal{P} \mathrm{Tr}(\rho_q^2),] and entanglement or correlation measures may be defined according to the physical system and experimental protocol. QCC0 should therefore be defined in relation to measurable quantum quantities rather than assumed to represent a new physical substance or consciousness mechanism. A general proposed mapping can be written as [QCC0 =\mathcal{Q}\left(\rho_q,\mathcal{C},\mathcal{E},\mathcal{I}\right),] where the arguments represent appropriately defined quantum-state and information-theoretic quantities. The exact definition of (\mathcal{Q}) is an empirical question. If QCC0 is intended to represent quantum coherence, then its numerical value should be compared with independently measurable coherence metrics. If it is intended to represent a broader computational invariant, that invariant must be explicitly defined and tested for reproducibility. Accordingly, QCC0 is treated in this work as a proposed computational construct rather than an established physical constant. 6. Relationship Between VFE1 and QCC0 The two proposed components serve different conceptual purposes. VFE1 is associated primarily with physical field evolution and temporal dynamics, whereas QCC0 is associated primarily with quantum-state correlation and computational representation. A combined model may therefore be expressed schematically as [ \mathcal{M} \mathcal{M}{\mathrm{GR/SR}}+\Delta\mathcal{M}{\mathrm{VFE1}}+\Delta\mathcal{M}_{\mathrm{QCC0}}.] The terms should not be interpreted as automatically additive physical forces or energies. They represent model contributions whose physical interpretation must be established through dimensional analysis and experiment. The framework consequently imposes three requirements: Every new variable must have a defined mathematical meaning. Every predicted observable must have physical units or be explicitly dimensionless. Every proposed correction must generate an experimentally distinguishable prediction. 7. Kapnack Solver The Kapnack Solver is the computational engine responsible for evaluating the model. Its role is not to establish physical validity by itself. Instead, it provides a reproducible numerical implementation of the equations being tested. A typical calculation follows: [\text{Initial Conditions}\rightarrow\text{Established Physics}\rightarrow\text{VFE1}\rightarrow\text{QCC0}\rightarrow\text{Observable Prediction}.] The solver should preserve the intermediate results so that an investigator can determine whether an observed difference originates from: the relativistic baseline, the VFE1 contribution, the QCC0 contribution, numerical approximation, parameter selection, or measurement uncertainty. This separation is essential for scientific reproducibility. 8. 369 Vortex Representation The 369 vortex formulation is incorporated as a proposed geometric or kinematic transformation within the computational framework. Rather than ass

•Aug 9, 2026•0 citations
According to standard quantum theory, the time evolution operator of a quantum system is independent of the state of the system. One can, however, consider systems in which this is not the case: the evolution operator may depend on the density operator itself. The presence of such modifications of quantum theory can be tested in long-baseline oscillation experiments.
Model-independent tests of quantum theory, such as Bell inequality violations, focus on static properties of the theory and do not rely on its dynamical aspects. Hence, this core part of quantum theory remains largely untested in a model-independent way. We show that the structure of quantum time evolution can be examined by testing the consistency between the state space and the dynamical laws. Considering a class of generalized phase-space theories, we find that certain quantum states can only be part of a theory if the time evolution is quantum: their evolution in anharmonic potentials would otherwise result in unphysical, negative marginal distributions. Furthermore, we demonstrate that the existence of the first excited state of a quantum harmonic oscillator is already sufficient to single out the Moyal bracket (quantum dynamics) to leading order in ℏ2\hbar^2ℏ2. We outline how theory-independent Wigner tomography of this state can be used to empirically exclude nonquantum dynamical theories.
The time-dependent Schrödinger equation forms the chapter's starting point. For a time-independent Hamiltonian, a quantum state may be time evolved with the standard, unitary time evolution operator. After obtaining this operator, an algorithm is provided by which a state may be time evolved, and measurement probabilities determined. A spin 1/2 example illustrates time evolution concretely. All this makes close contact with the discussion of unitary operators in Chapter 10. The time dependence of expectation values forms the next topic, followed by the concept of a constant of the motion, which is carefully contrasted with that of a stationary state. The energy-time uncertainty relations, which rest on a quite different conceptual footing than the ‘standard’ uncertainty relations, occupy the rest of the chapter. An example from spin 1/2 illustrates the energy-time uncertainty relations.
Abstract This chapter begins the discussion of the time evolution of an active quantum system. From the earlier chapters, time dependent physics has been observed through the presence of the time evolution of the phase of each eigenstate. The Hamiltonian itself is time independent. This represents the same kind of evolution of a classical system like the vibration of a tuning fork when it has been struck or the oscillation of an LC circuit if the capacitor is charged to some voltage and then the switch is closed. In the quantum case, the Hamiltonian has also been time independent. The time evolution evolves according the full-time dependent Schrödinger equation, depending only on a single initial condition of the state vector or wave function and the corresponding time evolution of the phase factor for each eigenstate. However in this chapter, we consider the case of when there is a time dependent Hamiltonian such as a sinewave generator or laser. As in the case of resonant tunneling, we see the importance in dynamics of resonant coupling. With an oscillating potential energy term, we see the presence of Rabi oscillations in the probability amplitude of a two-state system on resonance, which can be viewed as a quantum flip-flop between two states of a quantum bit (qubit).
Careful monitoring of harmonically bound (or as a limiting case, free) masses is the basis of current and future gravitational wave detectors, and of nanomechanical devices designed to access the quantum regime. We analyze the effects of stochastic localization models for state vector reduction, and of related models for environmental decoherence, on such systems, focusing our analysis on the non-dissipative forced harmonic oscillator, and its free mass limit. We derive an explicit formula for the time evolution of the expectation of a general operator in the presence of stochastic reduction or environmentally induced decoherence, for both the non-dissipative harmonic oscillator and the free mass. In the case of the oscillator, we also give a formula for the time evolution of the matrix element of the stochastic expectation density matrix between general coherent states. We show that the stochastic expectation of the variance of a Hermitian operator in any unraveling of the stochastic process is bounded by the variance computed from the stochastic expectation of the density matrix, and we develop a formal perturbation theory for calculating expectation values of operators within any unraveling. Applying our results to current gravitational wave interferometer detectors and nanomechanical systems, we conclude that the deviations from quantum mechanics predicted by the continuous spontaneous localization (CSL) model of state vector reduction are at least five orders of magnitude below the relevant standard quantum limits for these experiments. The proposed LISA gravitational wave detector will be two orders of magnitude away from the capability of observing an effect.
A Modular Time-Dynamics Framework Combining Relativistic Physics with the Proposed VFE1 and QCC0 Formalisms Abstract We propose a modular computational framework for investigating time evolution across relativistic, quantum, and geometric regimes. The framework separates established physical models from two proposed components: Vibrational Field Equation One (VFE1), intended to describe an additional field-dependent contribution to temporal evolution, and Quantum Computerization Consciousness Zero (QCC0), introduced as a quantitative measure of quantum-state correlation and computational coherence within the model. The framework does not replace established relativity or quantum mechanics. Instead, special relativity, general relativity, and conventional quantum-mechanical descriptions provide the reference layer against which the proposed VFE1 and QCC0 formulations can be evaluated. The Kapnack Solver provides the numerical engine, while the 369 vortex formulation is treated as a proposed geometric/kinematic transformation layer within the broader SDKP architecture. The central objective is falsifiable comparison: for a specified physical system, the framework calculates the prediction obtained from established physics, calculates the corresponding prediction obtained after inclusion of the proposed VFE1/QCC0 terms, and compares both predictions with independently measured data. Any improvement must be demonstrated quantitatively and must survive independent reproduction. 1. Introduction Time is a fundamental parameter in modern physics, but its operational behavior depends upon the physical state and reference frame of the system under consideration. In special relativity, proper time depends upon relative motion. For an inertial observer, the differential relation between proper time and coordinate time is [d\tau = dt\sqrt{1-\frac{v^2}{c^2}},] where (v) is relative velocity and (c) is the invariant speed of light. In general relativity, spacetime geometry is determined by the gravitational field, and the proper time measured by a clock depends upon its worldline through spacetime. In the weak-field limit, gravitational time dilation can be approximated by the corresponding metric or gravitational-potential correction. Quantum mechanics introduces a separate description of physical evolution in which states evolve according to a dynamical equation such as [ i\hbar\frac{\partial}{\partial t}\left|\psi(t)\right\rangle \hat{H}\left|\psi(t)\right\rangle .] These established theories provide the reference framework for the present proposal. The purpose of the present work is to investigate whether additional geometric, density, kinetic, positional, or field-state variables can provide useful predictive information beyond the standard reference calculations. Within the proposed SDKP architecture, these additional variables are organized through the Scale-Density-Kinetic/kinematic framework and associated computational methods. Two components are particularly relevant to temporal modeling: Vibrational Field Equation One (VFE1) — a proposed field-based temporal correction or extension. Quantum Computerization Consciousness Zero (QCC0) — a proposed quantitative descriptor of quantum correlation/coherence within the computational representation. Both are treated here as hypotheses requiring empirical validation rather than as established physical laws. 2. Established Physical Baseline 2.1 Special Relativity The first reference model is special-relativistic proper time. For motion at constant velocity, [d\tau =dt\sqrt{1-\frac{v^2}{c^2}}.] Integration gives [\Delta\tau =\Delta t\sqrt{1-\frac{v^2}{c^2}}] for constant (v). This relationship provides an experimentally established baseline for evaluating any proposed modification to velocity-dependent temporal evolution. The framework therefore requires the relativistic calculation to remain available independently of VFE1 and QCC0. 2.2 General Relativity For gravitational systems, the reference calculation is obtained from the spacetime metric [ds^2 = g_{\mu\nu}dx^\mu dx^\nu .] For a timelike trajectory, [d\tau^2 =-\frac{ds^2}{c^2}] under the appropriate metric-signature convention. Thus, gravitational time dilation is not introduced as an independent assumption of the proposed framework. It is calculated from the established spacetime geometry. In weak gravitational fields, the resulting prediction may be expressed approximately in terms of gravitational potential and velocity. These established predictions constitute the baseline against which the proposed VFE1 contribution is tested. 3. Proposed SDKP Temporal Representation The proposed SDKP architecture introduces a state representation containing geometric scale, density, kinetic state, and position: [\Psi =(S,\rho,K,P).] Here, (S) represents structural or geometric scale, (\rho) represents a density or density distribution, (K) represents kinetic state, (P) represents spatial position. The important distinction is that these quantities are treated as model variables rather than being assumed automatically to constitute new physical laws. The computational objective is therefore to determine whether an appropriate transformation [\Psi\longrightarrowT] can reproduce known temporal behavior and, more importantly, whether it produces independently testable predictions that improve upon established models. 4. Vibrational Field Equation One (VFE1) VFE1 is proposed as a field-dependent extension of temporal dynamics. The general form may be represented as [ \mathcal{T}_{\mathrm{VFE1}} \mathcal{F}\left(S,\rho,K,P,\Phi_v\right),] where (\Phi_v) represents the proposed vibrational-field state. The precise functional form of (\mathcal{F}) must be specified for each physical application and must not be selected solely to reproduce an existing observation. A useful formulation is therefore to decompose the prediction into a standard component and an additional VFE1 contribution: [ T_{\mathrm{model}} T_{\mathrm{standard}}+\Delta T_{\mathrm{VFE1}}.] The term [\Delta T_{\mathrm{VFE1}}] is the quantity that must be independently constrained. This construction has an important scientific advantage: the VFE1 hypothesis can be falsified. If [\Delta T_{\mathrm{VFE1}} \rightarrow 0] is consistently required by experimental data, then VFE1 provides no experimentally distinguishable temporal correction in that regime. Conversely, if a nonzero correction is predicted before measurement and is subsequently observed, the result provides evidence requiring further investigation. 5. Quantum Computerization Consciousness Zero (QCC0) QCC0 is proposed as a computational quantity associated with the representation of quantum-state correlation, coherence, or information consistency. For a quantum state described by density operator (\rho_q), established quantum mechanics provides quantities such as purity, [ \mathcal{P} \mathrm{Tr}(\rho_q^2),] and entanglement or correlation measures may be defined according to the physical system and experimental protocol. QCC0 should therefore be defined in relation to measurable quantum quantities rather than assumed to represent a new physical substance or consciousness mechanism. A general proposed mapping can be written as [QCC0 =\mathcal{Q}\left(\rho_q,\mathcal{C},\mathcal{E},\mathcal{I}\right),] where the arguments represent appropriately defined quantum-state and information-theoretic quantities. The exact definition of (\mathcal{Q}) is an empirical question. If QCC0 is intended to represent quantum coherence, then its numerical value should be compared with independently measurable coherence metrics. If it is intended to represent a broader computational invariant, that invariant must be explicitly defined and tested for reproducibility. Accordingly, QCC0 is treated in this work as a proposed computational construct rather than an established physical constant. 6. Relationship Between VFE1 and QCC0 The two proposed components serve different conceptual purposes. VFE1 is associated primarily with physical field evolution and temporal dynamics, whereas QCC0 is associated primarily with quantum-state correlation and computational representation. A combined model may therefore be expressed schematically as [ \mathcal{M} \mathcal{M}{\mathrm{GR/SR}}+\Delta\mathcal{M}{\mathrm{VFE1}}+\Delta\mathcal{M}_{\mathrm{QCC0}}.] The terms should not be interpreted as automatically additive physical forces or energies. They represent model contributions whose physical interpretation must be established through dimensional analysis and experiment. The framework consequently imposes three requirements: Every new variable must have a defined mathematical meaning. Every predicted observable must have physical units or be explicitly dimensionless. Every proposed correction must generate an experimentally distinguishable prediction. 7. Kapnack Solver The Kapnack Solver is the computational engine responsible for evaluating the model. Its role is not to establish physical validity by itself. Instead, it provides a reproducible numerical implementation of the equations being tested. A typical calculation follows: [\text{Initial Conditions}\rightarrow\text{Established Physics}\rightarrow\text{VFE1}\rightarrow\text{QCC0}\rightarrow\text{Observable Prediction}.] The solver should preserve the intermediate results so that an investigator can determine whether an observed difference originates from: the relativistic baseline, the VFE1 contribution, the QCC0 contribution, numerical approximation, parameter selection, or measurement uncertainty. This separation is essential for scientific reproducibility. 8. 369 Vortex Representation The 369 vortex formulation is incorporated as a proposed geometric or kinematic transformation within the computational framework. Rather than ass