Monarch Quantum, Inc.

Monarch Quantum, Inc. has raised $73.6M in total funding. The most recent round was Series A.

Monarch Quantum, Inc. is headquartered in San Diego, CA.

We’re an integrated photonics company in California building the light engines that power the next era of quantum technology — from advanced computing to precision sensing.

Quantum computing, sensing, and communications systems are bottlenecked by a lack of reliable, high-precision photonics hardware that can be manufactured and scaled beyond room-filling laboratory setups of lasers, optics, modulators, and detectors.

Monarch Quantum builds integrated, modular 'light engines' — plug-and-play photonics subsystems combining chip-scale lasers, modulators, detectors, fiber optics, low-noise electronics, and control systems — as a turn-key OEM platform for quantum computing, sensing, and communications integrators.

The company points to a formal Quality Management System for reliability/availability/maintainability, continuous investment in manufacturing and metrology infrastructure for scalable production, and a team with decades of experience building and scaling photonics and quantum-sensing companies.

San Diego integrated-photonics company founded in 2025 by photonics industry veteran Dr. Timothy Day; surpassed $100M in combined capital and customer contracts by early 2026 on a $55M growth round.