This study reports the first observation of non-perturbative high harmonic generation (HHG) in solids driven by a macroscopic quantum state of light, bright squeezed vacuum (BSV). BSV, generated in a single spatiotemporal mode, provides a significantly more efficient means of generating high harmonics compared to classical light of the same mean intensity. BSV's broad photon-number distribution and sub-cycle electric field fluctuations enable access to free carrier dynamics over a much broader range of peak intensities than classical light. The research demonstrates that BSV enhances harmonic yield and reveals a boost in multiphoton processes. Numerical simulations support these findings, extending previous studies from gases to solids. The sparse nature of BSV light also enables suppression of sample damage, allowing for probing of electron dynamics in previously inaccessible regimes. BSV's unique properties, including its sub-shot-noise photon-number correlations and polarization entanglement, offer new opportunities for exploring extreme nonlinearities in solids. The study highlights the potential of BSV as a powerful tool for quantum optics and extreme nonlinear physics, enabling the exploration of phenomena inaccessible with classical light. The results suggest that BSV can be used to drive HHG in gases, liquids, and wide-bandgap solids, reaching the extreme ultraviolet spectral regime. The findings contribute to the development of quantum optics with extreme intensities, moving beyond traditional low photon number focus. The study also shows that BSV can be used to control HHG through subcycle quantum noise engineering, similar to control through sub-cycle field engineering. The research opens new avenues for exploring quantum interference effects and many-body correlations in solids, with applications in quantum state engineering. The study also demonstrates that HHG can be used to probe extreme regimes in solids, such as the harmonic yield saturation in amorphous silicon. The results suggest that BSV can be used to access the strong-field regime of quantum optics, enabling the study of solid-state samples in extreme conditions. The study provides a new method for exploring extreme nonlinearities in solids and contributes to the development of extreme nonlinear quantum spectroscopy. The findings also suggest that BSV can be used to enhance the intensity range over which harmonic yield follows a perturbative scaling, as well as to achieve higher exponents in the BSV-generated 7th harmonic at low pump intensities. The study also shows that BSV can be used to observe quantum interference effects and many-body correlations in solids, with applications in quantum state engineering. The research highlights the potential of BSV as a powerful tool for quantum optics and extreme nonlinear physics, enabling the exploration of phenomena inaccessible with classical light. The study also demonstrates that BSV can be used to control HHG through subcycle quantum noise engineering, similar to control through sub-cycle field engineering. The findings contribute to the development of quantum optics with extreme intensities, moving beyond traditional low photon number focus. The study provides a new method for exploring extreme nonlinearities in solids and contributes to the developmentThis study reports the first observation of non-perturbative high harmonic generation (HHG) in solids driven by a macroscopic quantum state of light, bright squeezed vacuum (BSV). BSV, generated in a single spatiotemporal mode, provides a significantly more efficient means of generating high harmonics compared to classical light of the same mean intensity. BSV's broad photon-number distribution and sub-cycle electric field fluctuations enable access to free carrier dynamics over a much broader range of peak intensities than classical light. The research demonstrates that BSV enhances harmonic yield and reveals a boost in multiphoton processes. Numerical simulations support these findings, extending previous studies from gases to solids. The sparse nature of BSV light also enables suppression of sample damage, allowing for probing of electron dynamics in previously inaccessible regimes. BSV's unique properties, including its sub-shot-noise photon-number correlations and polarization entanglement, offer new opportunities for exploring extreme nonlinearities in solids. The study highlights the potential of BSV as a powerful tool for quantum optics and extreme nonlinear physics, enabling the exploration of phenomena inaccessible with classical light. The results suggest that BSV can be used to drive HHG in gases, liquids, and wide-bandgap solids, reaching the extreme ultraviolet spectral regime. The findings contribute to the development of quantum optics with extreme intensities, moving beyond traditional low photon number focus. The study also shows that BSV can be used to control HHG through subcycle quantum noise engineering, similar to control through sub-cycle field engineering. The research opens new avenues for exploring quantum interference effects and many-body correlations in solids, with applications in quantum state engineering. The study also demonstrates that HHG can be used to probe extreme regimes in solids, such as the harmonic yield saturation in amorphous silicon. The results suggest that BSV can be used to access the strong-field regime of quantum optics, enabling the study of solid-state samples in extreme conditions. The study provides a new method for exploring extreme nonlinearities in solids and contributes to the development of extreme nonlinear quantum spectroscopy. The findings also suggest that BSV can be used to enhance the intensity range over which harmonic yield follows a perturbative scaling, as well as to achieve higher exponents in the BSV-generated 7th harmonic at low pump intensities. The study also shows that BSV can be used to observe quantum interference effects and many-body correlations in solids, with applications in quantum state engineering. The research highlights the potential of BSV as a powerful tool for quantum optics and extreme nonlinear physics, enabling the exploration of phenomena inaccessible with classical light. The study also demonstrates that BSV can be used to control HHG through subcycle quantum noise engineering, similar to control through sub-cycle field engineering. The findings contribute to the development of quantum optics with extreme intensities, moving beyond traditional low photon number focus. The study provides a new method for exploring extreme nonlinearities in solids and contributes to the development