Diamond-based nitrogen-vacancy (NV) quantum systems face critical scalability barriers due to substrate) and limited wafer sizes (100× while maintaining quantum-grade thermal management. Through coupled multiphysics simulations (COMSOL, LAMMPS) and analytical modeling, we show that 5 μm boron-glass (3-5% B) on = 28-35 W/ (m·K) at 233 K—10×50 μm pyrolytic graphite achieves effective thermal conductivity keffhigher than diamond-based architectures—enabling gate frequencies >50 MHz with thermoelectric (Peltier) cooling alone. ≈ 2000 W/m·K) combined with boron'sThe exceptional in-plane thermal conductivity of graphite (kparallelparamagnetic spin properties creates a dual-function platform: the glass layer hosts defect-based qubits (boron dangling bonds, oxygen vacancies) while graphite provides both thermal dissipation andelectromagnetic shielding. At -40°C, this system achieves cryogenic-level performance (<100 MHz quantumoperations) at <500/wafer material cost versus 50k+ for diamond substrates. 15We demonstrate viability for color-center-free quantum computing using intrinsic glass defects (10cm -311density), nuclear spin qubits (B, I=3/2), and hybrid phonon-spin coupling schemes. This architecturedemocratizes quantum technology access, enabling 100 mm wafer-scale fabrication with conventional glassprocessing, and unlocks applications in quantum sensing arrays, distributed quantum networks, and CMOS-compatible quantum-classical integration. Our approach disrupts the 2B quantum substrate market byproving that exotic materials are not prerequisites for scalable quantum systems.
Jean-yves Lozac'h (Thu,) studied this question.