Photon Queue has raised $4 million in an oversubscribed seed financing round to expand its quantum memory technology. Playground Global led the investment.
The company will use the funding to accelerate product development, strengthen manufacturing capabilities and expand customer deployments. Photon Queue is targeting quantum computing companies, national laboratories and academic research institutions.
The financing follows early commercial contracts with Sandia National Laboratories and the University of Maryland. Photon Queue has deployed its first commercial quantum memory device with customers at both institutions.
Quantum memories are designed to temporarily store photons until they are needed by a computing or communications system. This capability can help synchronize photons moving through increasingly complex quantum networks.
Large-scale quantum systems may connect multiple smaller processors rather than relying on one centralized machine. Coordinating the timing and movement of individual photons between those systems is a significant technical challenge.
Photon Queue stores photons directly in free-space optical loops using proprietary high-reflectivity mirrors and optical switches. Its systems operate at room temperature and use standard electrical power.
The company said its approach does not require cryogenic cooling, vacuum systems or complex photon-conversion processes. Eliminating those requirements could make quantum memory systems easier to install and integrate with existing research and computing platforms.
Photon Queue’s devices are designed to work across a wide range of wavelengths. This could make them compatible with photonic, trapped-ion, neutral-atom and other quantum computing architectures.
The company claims its technology delivers high efficiency and broad bandwidth. These performance characteristics are important because losing photons or limiting their transmission rates can reduce the reliability and scale of quantum networks.
Photon Queue was founded in 2024 as a spinout from the University of Illinois Urbana-Champaign. The company is led by co-founders Nathan Arnold, its CEO, and Kelsey Ortiz, its CTO.
The founding team has experience in quantum optics, photonic hardware and technology commercialization. Photon Queue is also a graduate of the Duality Quantum Accelerator and a corporate partner of the Chicago Quantum Exchange.
The company won the Q2B Startup Pitch Competition, and Arnold is a fellow at Chain Reaction Innovations, a U.S. Department of Energy entrepreneurship program operated at Argonne National Laboratory.
Photon Queue recently received an additional $500,000 from the New Mexico Economic Development Department and Roadrunner Venture Studios. That funding will support expansion in New Mexico and deeper engagement with the region’s national laboratories and quantum technology organizations.
KEY QUOTES:
“Useful quantum computing will require photons to move through networks with extraordinary precision, efficiency and timing. That is the problem Photon Queue was founded to solve.”
“In less than two years, we have taken technology from the lab to deployed commercial hardware with leading national lab and university customers. Our work with Sandia and the University of Maryland is a major validation point that quantum memory is becoming essential infrastructure for the next era of computing.”
Nathan Arnold, Co-Founder and CEO of Photon Queue
“Quantum computing is hitting a scale problem that better qubits alone cannot solve. The industry needs new infrastructure to move, store and synchronize photons with far greater efficiency.”
“Photon Queue has built an elegant solution, turning breakthrough quantum optics into commercial hardware, with early customer traction. We believe they are a foundational company that will define the quantum memory category.”
Marissa Ramirez de Chanlatte, Investor at Playground Global
“Quantum memories are a critical enabling technology for distributed quantum systems, and performance, efficiency and ease of integration are essential.”
“Photon Queue’s room-temperature, free-space approach is compelling because it stores photons directly without the complexity of cryogenics, vacuum systems or transduction. We look forward to working with the Photon Queue team as they continue developing practical quantum memory hardware for our research in quantum networking, sensing, and communication.”
Saikat Guha, Clark Distinguished Chair Professor of Electrical and Computer Engineering at the University of Maryland and Director of the NSF Center for Quantum Networks
