This chapter positions Quantum Warfare (QW) as the next evolutionary leap beyond fifth and looming Sixth-Generation Warfare (6GW), where control over matter and information gives way to control over uncertainty itself. Framed through the Clausewitz–Heisenberg analogy, it argues that just as observation collapses a quantum wave, strategic decision collapses geopolitical possibility. Warfare thus becomes the art of shaping probability—weaponising indeterminacy through quantum computation, sensing, and communication. Integrating Realism, Idealism, HST, AICST, and Constructivism, the chapter proposes a unified Meta-Theory of Quantum Power in which knowledge, ethics, and sovereignty are entangled. Empirical cases—including China’s QNet, DARPA’s Quantum Aperture, and the EU’s EuroQCI network—illustrate how quantum infrastructures now constitute the strategic architecture of global order. Trust becomes physical, embedded in the unhackable logic of quantum mechanics rather than in political or institutional norms. Philosophically, the chapter reveals the paradox of moral decoherence: as machines reason probabilistically, responsibility disperses across algorithmic systems. It calls for renewed ethical frameworks grounded in cognitive sovereignty, procedural transparency, and gender-inclusive accountability to safeguard human agency in autonomous decision environments. Serving as a bridge to the geopolitical case studies of Chapters 9–11 and the normative synthesis of Chapters 12–13, this chapter redefines modern conflict as an epistemic struggle—over who controls not only information, but the very probabilities of truth.