What question did this study set out to answer?

This work aims to establish a theoretical basis for propulsion systems that do not require fuel, using quantum mechanics.

May 16, 2026Open Access

Quantum Crystal Surf Drive (QCSD) v5.3 — Theoretical Framework for Fuel-Free Propulsion via Time-Modulated Photonic Momentum Transfer

Key Points

This work aims to establish a theoretical basis for propulsion systems that do not require fuel, using quantum mechanics.
Developed a framework for Quantum Crystal Surf Drive (QCSD) leveraging NV centers in diamond.
Analyzed the impact of time-modulated quantum fields on photon behavior using phase-gradient mechanics.
Addressed theoretical validity through various calculations, including stress-energy tensor symmetry and many-body decoherence.
Predicted controlled thrust could be achieved without reaction mass via resonant momentum transfer.
Validated theoretical constructs regarding dispersive regime and inter-cluster interactions.
Numerically estimated outcomes are measurable with existing tabletop instruments, indicating practical applicability.

Abstract

A theoretical framework for fuel-free propulsion using time-modulated quantum fields. The Quantum Crystal Surf Drive (QCSD) utilizes NV centers in isotopically purified diamond as Floquet-type time crystals to generate a periodically modulated photonic environment. Photons interacting with this environment undergo resonant momentum transfer via a phase-gradient surfer mechanism, producing controlled thrust without reaction mass. Version 5.3 (final) closes all identified theoretical attack surfaces: dispersive regime validity as physical power ceiling, inter-cluster cross-talk bounded analytically, inertial immunity derived from electromagnetic stress-energy tensor symmetry, many-body decoherence bounded via dipolar broadening calculation, lattice back-action from thrust stress quantified, and external observer SR/GR consistency confirmed. An explicit Limitations and Open Questions section enumerates remaining empirical unknowns for Stage 2 experimental resolution. All predictions are numerically estimated and measurable with current table-top equipment. No phenomenological free parameters in the core Hamiltonian. Author: Karel Fildan, Prague, 2026. License: CC BY 4.0

Quantum Crystal Surf Drive (QCSD) v5.3 — Theoretical Framework for Fuel-Free Propulsion via Time-Modulated Photonic Momentum Transfer

Key Points

Abstract

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