QUANTUM DECOHERENCE AND QUANTUM COMPUTING
Ilie Barbu
Abstract
THE BARBU-ILIE HYDRODYNAMIC VACUUM MODEL AS A PHENOMENOLOGICAL FRAMEWORK FOR QUANTUM DECOHERENCE AND QUANTUM COMPUTING: EXPLORATORY FOUNDATIONS AND FALSIFIABLE PREDICTIONS Author: Ilie Barbu Independent Researcher Pitești, Argeș, România Email: ilie.barbu@yahoo.com Date: 28 May 2026 Abstract We present the Barbu-Ilie (BI) Hydrodynamic Vacuum Model as a deterministic, causal phenomenological framework for quantum decoherence, reinterpreting the Gorini–Kossakowski–Sudarshan–Lindblad (GKSL) master equation through two fundamental, directly measurable mechanical fields that jointly characterise the physical vacuum as a dual-field mechanical continuum: the **Universal Pressure Field** $P(x^\\mu)$, with background value $P_{\\text{BI}} \\equiv 1/\\varepsilon_0 = 1.129409066 \\times 10^{11} \\text{ Pa}$, and the **Effective Mass Density Field** $\\rho(x^\\mu)$, with background value $\\rho_{\\text{BI}} \\equiv \\mu_0 = 1.25663706212 \\times 10^{-6} \\text{ kg m}^{-3}$. These two CODATA-anchored fields are not philosophical constructs; they are the exact vacuum permittivity and permeability of free space, reinterpreted as the elastic pressure and inertial density of a mechanical continuum. Together they determine the vacuum wave impedance $Z_{\\text{BI}} = \\sqrt{P_{\\text{BI}}\\rho_{\\text{BI}}} = 376.730313668\\ \\Omega$ and the universal dynamic viscosity $\\eta_{\\text{BI}} = 5.969 \\times 10^{-31} \\text{ Pa}\\cdot\\text{s}$.\\n\\nThe central thesis corrects a profound historical oversight in Zurek’s decoherence theory: standard treatments identify the macroscopic thermal environment (photons, phonons, gas molecules) as the fundamental decoherence bath, yet assume that a qubit placed in a perfect engineered vacuum at absolute zero is truly \"isolated.\" The BI model demonstrates rigorously that the dual-field continuum $\\{P(x^\\mu), \\rho(x^\\mu)\\}$ constitutes an inescapable, universal dissipative environment: no quantum system can be isolated from the very mechanical continuum whose density perturbations are the wave function $\\Psi$.\\n\\nSpecifically, $\\Psi(\\mathbf{r}, t)$ is reinterpreted as a small-amplitude perturbation $\\delta\\rho$ of the Density Field $\\rho(x^\\mu)$, elastically restored by the Pressure Field $P(x^\\mu)$ according to the constitutive relation $\\delta P = c^2 \\delta\\rho$. We derive the BI vacuum-induced decoherence rate $\\Gamma_\\eta = (\\eta_{\\text{BI}}/P_{\\text{BI}})\\omega_0^2 = 5.285 \\times 10^{-42} \\cdot \\omega_0^2 \\text{ s}^{-1}$, identify the dissipation ratio $\\eta_{\\text{BI}}/P_{\\text{BI}}$ as the microscopic origin of coherence persistence at low frequencies and of the quantum-to-classical transition at high collective frequencies, re-derive the Casimir effect as geometric screening of $P_{\\text{BI}}$, and propose a $360^\\circ$ hydrodynamic Retinal Shield blueprint for practical qubit isolation. All predictions are framed as falsifiable experimental targets.\\n\\n**Keywords:** Barbu-Ilie vacuum model, dual-field mechanical continuum, Universal Pressure Field, Effective Mass Density Field, quantum decoherence, GKSL Lindblad equation, vacuum viscosity, vacuum impedance, Casimir effect, qubit isolation, hydrodynamic shield, quantum-to-classical transition.\\n\\n---\\n\\n## 1 Introduction and Central Thesis\\nThe modern theory of quantum decoherence, as formulated by Zeh [1], Zurek [2, 3], and Caldeira–Leggett [4], provides a mathematically rigorous account of how quantum superpositions are destroyed by coupling to an external environment. Its crowning achievement — einselection and the emergence of classical pointer states — has been confirmed in experiments spanning molecular interferometry, superconducting circuits, and ion traps [5–8].\\n\\nYet the theory harbours an unacknowledged conceptual gap. When practitioners speak of “isolating” a qubit — cooling it to millikelvin temperatures, placing it in a cryostat, shielding it from electromagnetic radiation — they implicitly assume that the residual environment after all such precautions is negligibly small. The Barbu-Ilie (BI) Hydrodynamic Vacuum Model identifies this assumption as incorrect at a foundational level. The physical vacuum is not an empty geometric background; it is a **dual-field mechanical continuum** defined precisely and measurably by two fields: the **Universal Pressure Field** $P(x^\\mu)$, whose background value $P_{\\text{BI}} = 1/\\varepsilon_0 = 1.129409066 \\times 10^{11} \\text{ Pa}$ is fixed by the CODATA value of the electric permittivity of free space, and the **Effective Mass Density Field** $\\rho(x^\\mu)$, whose background value $\\rho_{\\text{BI}} = \\mu_0 = 1.25663706212 \\times 10^{-6} \\text{ kg m}^{-3}$ is fixed by the magnetic permeability of free space. Both quantities are SI-unit measurables with sub-ppb experimental precision. A quantum system cannot be decoupled from this continuum because the wave function $\\Psi$ is a perturbation of $\\rho(x^\\mu)$ elastically restored by $P(x^\\mu)$. The continuum also carries a non-zero dynamic viscosity $\\eta_{\\text{BI}} = 5.969 \\times 10^{-31} \\text{ Pa}\\cdot\\text{s}$, which generates an inescapable, vacuum-intrinsic decoherence channel.\\n\\nThis paper develops the mathematical consequences of this identification. Section 2 establishes the physical wave equation and the elastic properties of the dual-field vacuum continuum $\\{P, \\rho\\}$. Section 3 maps the GKSL Lindblad dissipators onto the BI viscosity, deriving the explicit BI decoherence rate and its profound $\\omega_0^2$ scaling. Section 4 re-derives the Casimir effect as elastic pressure screening. Section 5 proposes the $360^\\circ$ Retinal Shield blueprint. Section 6 collects falsifiable predictions. Section 7 concludes.\\n\\n### Definitive Barbu-Ilie Parameter Matrix (CODATA-aligned)\\n\\n| Symbol | Value | Units | Physical Identity |\\n| :--- | :--- | :--- | :--- |\\n| $c$ | $2.99792458 \\times 10^8$ | $\\text{m s}^{-1}$ | Speed of light (specific elasticity) |\\n| $c^2$ | $8.98755179 \\times 10^{16}$ | $\\text{m}^2 \\text{ s}^{-2}$ | Elastic modulus of vacuum |\\n| $\\varepsilon_0$ | $8.8541878128 \\times 10^{-12}$ | $\\text{F m}^{-1}$ | Electric compressibility |\\n| $\\mu_0$ | $1.25663706212 \\times 10^{-6}$ | $\\text{H m}^{-1}$ | Effective magnetic density |\\n| $P_{\\text{BI}}$ | $1.129409066 \\times 10^{11}$ | $\\text{Pa}$ | Vacuum pressure $= 1/\\varepsilon_0$ |\\n| $\\rho_{\\text{BI}}$ | $1.25663706212 \\times 10^{-6}$ | $\\text{kg m}^{-3}$ | Vacuum mass density $= \\mu_0$ |\\n| $Z_{\\text{BI}}$ | $376.730313668$ | $\\Omega$ | Wave impedance $= c\\mu_0 = \\sqrt{P_{\\text{BI}}\\rho_{\\text{BI}}}$ |\\n| $\\eta_{\\text{BI}}$ | $5.969 \\times 10^{-31}$ | $\\text{Pa}\\cdot\\text{s}$ | Universal dynamic viscosity |\\n| $\\eta_{\\text{BI}}/P_{\\text{BI}}$ | $5.285 \\times 10^{-42}$ | $\\text{s}$ | Fundamental dissipation ratio |\\n\\n---\\n\\n## 2 Physical Wave Propagation and the Elasticity of the Vacuum Medium\\n\\n### 2.1 The Wave Function as a Perturbation of the Dual-Field Vacuum Continuum\\n**Definition 2.1 (Dual-Field Mechanical Continuum of the Vacuum).** The physical vacuum is a mechanical continuum fully characterised by two spatially and temporally varying scalar fields:\\n\\n* **Universal Pressure Field:** $P(x^\\mu)$, with background equilibrium value $P_{\\text{BI}} \\equiv 1/\\varepsilon_0 = 1.129409066 \\times 10^{11} \\text{ Pa}$. This field represents the elastic restoring force per unit area of the continuum and is directly identified with the electric compressibility of free space.\\n* **Effective Mass Density Field:** $\\rho(x^\\mu)$, with background equilibrium value $\\rho_{\\text{BI}} \\equiv \\mu_0 = 1.25663706212 \\times 10^{-6} \\text{ kg m}^{-3}$. This field represents the inertial density of the continuum and is directly identified with the magnetic permeability of free space.\\n\\nBoth values are CODATA-anchored SI measurables. Their ratio defines the sole propagation speed of disturbances in the continuum:\\n$$ c = \\sqrt{\\frac{P_{\\text{BI}}}{\\rho_{\\text{BI}}}} = \\sqrt{\\frac{1}{\\varepsilon_0 \\mu_0}} = 2.99792458 \\times 10^8 \\text{ m s}^{-1} $$\\n\\nIn the Copenhagen and many-worlds formulations, the wave function $\\Psi(\\mathbf{r}, t)$ is a complex-valued object defined on an abstract Hilbert space, acquiring physical meaning only through Born’s probabilistic rule at the moment of measurement. The BI model replaces this ontology with a strictly mechanical one: $\\Psi(\\mathbf{r}, t)$ is a *small-amplitude perturbation of the Effective Mass Density Field*,\\n$$ \\delta\\rho(\\mathbf{r}, t) \\equiv \\rho_{\\text{BI}} \\Psi(\\mathbf{r}, t), \\quad \\delta\\rho \\ll \\rho_{\\text{BI}} \\quad (2.0) $$\\nelastically restored by the Universal Pressure Field $P(x^\\mu)$ via the isentropic constitutive relation:\\n$$ \\delta P(\\mathbf{r}, t) = c^2 \\delta\\rho(\\mathbf{r}, t) = c^2 \\rho_{\\text{BI}} \\Psi(\\mathbf{r}, t) \\quad (2.0\\text{b}) $$\\nThe amplitude squared $|\\Psi|^2$ therefore measures the *fractional density variation* of the vacuum continuum at a given spacetime point — a locally measurable mechanical quantity — rather than an abstract probability in the frequentist sense. Non-local quantum correlations are, within this framework, long-range elastic correlations of the Density Field $\\rho(x^\\mu)$ mediated by the Pressure Field $P(x^\\mu)$.\\n\\nThis reinterpretation has three immediate and non-trivial physical consequences. First, $\\Psi$ must satisfy the wave equation of the dual-field continuum (derived in Section 2.2), which yields the standard Schrödinger equation in the non-relativistic limit. Second, any quantum system is intrinsically embedded in the continuum; there is no operational procedure that decouples $\\rho(x^\\mu)$ fluctuations from a system that *is* a structured perturbation of $\\rho(x^\\mu)$. Third, and most importantly for decoherence theory, the non-zero dynamic vis