Phasalloy-QD is a niobium-tantalum-silicon alloy whose quantum-assembled crystalline structure supports coherent quantum superposition states in macroscopic domains at room temperature, enabling the material itself to function as a distributed quantum register — effectively a metal that computes. Individual domains can be initialized, entangled, and read out using applied electromagnetic fields, making Phasalloy-QD the substrate of choice for embedded quantum processing in physical structures. The material is simultaneously a structural metal and a quantum computational medium, with coherence times measured in milliseconds — long enough for useful computation.