Photon Queue

Photon Queue is a quantum hardware company that develops optical quantum memory devices used to store, synchronize and release single photons in quantum computing, networking, communications and metrology systems. Its devices store photons directly in free-space optical loops built from proprietary high-reflectivity mirror systems and low-loss optical switches, a linear-optics approach that operates at room temperature on standard electrical power and does not require cryogenics, vacuum systems or quantum frequency transduction. Product functions described by the company include configurable multiplexing (synchronizing asynchronous photon sources into a coherent output), photon buffering via fixed-delay reflection cells, and qubit conversion between polarization and time-bin encodings.

The company positions quantum memory as infrastructure needed when quantum platforms scale by networking many smaller processors together, where synchronizing single photons across systems becomes a bottleneck. Because the free-space architecture supports a broad wavelength range, the devices are presented as compatible with photonic, trapped-ion, neutral-atom and other quantum computing architectures, as well as quantum sensing arrays and optical communications networks. Published device specifications include memory bandwidth greater than 1 THz, user-specified center wavelength from 350 to 2000 nm, loop durations configurable between 10 and 10,000 ns, maximum repetition rate of 1 MHz average (up to 5 MHz burst), noise below 10^-4 noise photons per pulse and fidelity above 0.99.

Photon Queue was founded in 2024 as a spinout from the University of Illinois Urbana-Champaign and is headquartered in Champaign, Illinois, with a presence at the University of Illinois Research Park. Its underlying quantum memory technology was pioneered over roughly two decades by the research group of Prof. Paul Kwiat at UIUC.

Founding story

Photon Queue was founded in 2024 as a spinout of the University of Illinois Urbana-Champaign, commercializing quantum memory technology developed over roughly two decades in the research group of Prof. Paul Kwiat. It is led by co-founders Nathan Arnold (CEO), who holds a Ph.D. from UIUC and is a fellow at Chain Reaction Innovations at Argonne National Laboratory, and Kelsey Ortiz (CTO), who is completing a PhD at UIUC where she worked on the Space Entanglement and Annealing QUantum Experiment (SEAQUE).

Business model

Photon Queue designs and manufactures quantum memory hardware sold and delivered as devices to customers such as national laboratories, universities and quantum computing companies, with contracts reported at Sandia National Laboratories and the University of Maryland. Devices are configurable to customer requirements, including operating wavelength and optical loop durations, and multimode capacity is quoted on enquiry.

Revenue derives from commercial hardware contracts and deployments of quantum memory devices with research institutions, national laboratories and quantum computing companies.

Traction

Photon Queue reports contracts with and first commercial device deployments at Sandia National Laboratories and the University of Maryland, and describes its seed round as oversubscribed. The company is building an assembly, testing and verification line in Albuquerque and is hiring across optics, quantum hardware and systems engineering. Team listings on its site show a small staff including a CEO, CTO, a founding engineer for optical systems and several interns; a third-party company profile lists 1-10 full-time employees.

Latest developments

In July 2026 Photon Queue closed an oversubscribed $4 million seed round led by Playground Global, via the Playground Genesis Fund, with participation from Cerberus Capital Management, Illinois Ventures, Roadrunner Venture Studios and MFV Partners; the proceeds are earmarked for product development, manufacturing capacity and customer deployments. Days earlier, the company announced $500,000 from the New Mexico Economic Development Department and Roadrunner Venture Studios to support a New Mexico expansion, including an assembly, testing and verification line in the Roadrunner Quantum Lab in Albuquerque. A company news post dated July 26, 2026 also notes the closing of the seed round, and earlier 2026 posts record two new team members in May and a team trip in June.