11 Photonic Quantum Computing Companies to Know [2026]

Insider Brief

• Photonic quantum computing uses photons instead of matter-based qubits, offering room-temperature operation, fiber-network compatibility, and multiple architectural approaches under active development.
• A global group of companies including PsiQuantum, Xanadu, and Quandela are advancing distinct photonic strategies spanning silicon photonics, squeezed light, and single-photon systems.
• Key technical barriers remain around photon loss, deterministic generation, and scalable error correction, with significant investment and government backing accelerating progress toward practical systems.