This work presents a speculative theoretical model for a novel quantum gate inspired by the properties of tachyons, hypothetical particles associated with speeds greater than that of light. The research proposes the Tachyonic Phase Gate (TPG), a quantum gate based on non-Hermitian dynamics and PT symmetry, exploring how a tachyonic field could modify quantum states in ways inaccessible to conventional quantum gates. The article develops a description of the mathematical and conceptual architecture of the TPG, including its dynamic behavior, transitions between different physical phases, and effects on the states of individual qubits and entangled systems. A tachyonic entanglement gate for two qubits is also introduced, and potential connections with phenomena such as closed time-curves, relativistic causality, and advanced computational complexity are analyzed. Furthermore, the work compares TPG with standard quantum computing gates, showing that this approach could formally extend traditional models of quantum operations to non-unitary regimes inspired by imaginary mass physics and PT-symmetric systems. The study emphasizes that tachyons lack experimental evidence and that the proposed framework is explicitly speculative. However, some mathematical elements related to non-Hermitian dynamics and PT symmetry do have experimental support in modern optical systems, making the work a conceptual exploration of possible future extensions of quantum computing and theoretical physics.