Metastable Quantum Cavitation as a Continuous Bidirectional Transport Framework

This work develops a conceptual framework for metastable quantum transport based on continuous, phase-controlled tunneling between coupled subsystems. In contrast to an earlier capture–deadband–release formulation, the revised architecture maintains finite coupling throughout the transport cycle and treats reverse flow not necessarily as a loss, but as part of the total bidirectional dynamical activity of the system. The framework combines metastable interfacial modulation, quantum tunneling, local entropy/information redistribution, open-system transport, and explicit energy transduction. A series of dimensionless proof-of-principle toy models is used to test thermodynamic consistency and to distinguish four quantities that can otherwise be easily conflated: local entropy redistribution, net current, bidirectional current activity, and extractable work. Closed-system simulations preserve global von Neumann entropy while allowing local entropies and correlations to evolve. Open-system models explicitly account for reservoir energy, external drive work, dissipation, and load extraction. The numerical tests show that metastable phase modulation can modify internal bidirectional current activity and energy exchange with the drive. In a selected parameter regime, a passive bidirectional transduction model also exhibits a small, phase-dependent increase in load output relative to a non-metastable control. The results do not imply entropy-to-energy conversion, over-unity operation, or a new fundamental entropy current. Rather, they identify a thermodynamically consistent transport architecture whose potential novelty lies in combining continuous metastable modulation with the operational use of bidirectional current activity as a possible transduction resource. The work concludes by defining a falsifiable research program toward a microscopic, platform-specific realization and experimental comparison with an equivalent non-metastable control. The revised manuscript also develops a separate exploratory semiclassical extension, examining the chain from metastable transport to stress-energy redistribution, linearized metric response, and recursive backreaction. The analysis indicates that a nonzero stress-energy perturbation can formally source a metric perturbation, while gravitational coupling at ordinary laboratory scales makes the resulting response extremely small and the recursive feedback strongly subcritical. The extension therefore defines a quantitative failure boundary for practical causal engineering rather than providing evidence of a macroscopic modification of spacetime causality.