Quantica is an innovative programming language that allows the simultaneous use of classical control flow and quantum computation in one unified model. The language design, execution semantics, and primary concerns of the type system controlling classical-quantum interaction are all presented in this preprint. Furthermore, the paper outlines the initial reference implementation, which includes the compiler front end, execution model, and backend infrastructure, along with the sample programs representing quantum gates, entanglement, measurement-driven control flow, and variational hybrid algorithms. The authors finish by pointing out the existing limitations and suggesting the next steps in the unified quantum programming language design as future research. Quantica Github Repo