Fractal Phononic Architecture for Quantum Computing: From COLDFIRE-2.17 to THz-Scale Spin Qubits

This paper presents a novel quantum computing architecture derived from the COLDFIRE-2.17 fractal resonator. By substituting deuterium with solid-state nitrogen doping (NV-likecenters) within a five-level recursively structured Silicon Carbide (SiC) nanotube, we de-monstrate a transition from fusion-oriented tunneling enhancement to quantum coherenceprotection. Our simulations indicate that at a target frequency of 15.1 THz, the fractal geo-metry acts as a phononic bandgap shield, providing a "quasi-stationary" coherence regime.We predict gate speeds in the femtosecond range and a total tunneling-assisted operationalgain of 1034 orders of magnitude compared to non-structured SiC substrates.