Light in the Loop: How Quantum Mechanics Powers Optical Computing—and Where Quantum Computers Fit

From classical light-based accelerators to photon-based qubits, a clear guide to the technologies—and the important difference between them.

The provided source differentiates between traditional optical computing and photonic quantum computing, clarifying how quantum mechanics functions within both realms. While standard optical systems utilize classical light waves and interference to accelerate tasks like matrix multiplication, photonic quantum computing actively harnesses qubits driven by superposition and entanglement. Although quantum physics is foundational to the physical hardware of both approaches—including lasers, photodetectors, and materials—relying on quantum components is not the same as executing a true quantum calculation. Ultimately, most contemporary optical technology designed for artificial intelligence relies on classical photonic accelerators rather than quantum computing architectures.