OptQC Maps the Path from Its First Room-Temperature Optical Quantum Computer to Fault Tolerance

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OptQC Maps

First machine installed at AIST, an NTT-led Series A2, and two recent papers on a modular fault-tolerant architecture and all-optical feedforward

TOKYO, October 26, 2026. OptQC Corp., a Tokyo-based developer of optical quantum computers, has moved from laboratory research to an operating machine in under two years. Since July the company has unveiled its first optical quantum computer, MoQuren, signed a capital and business alliance with NTT, and closed a JPY 7.0 billion (approx. US$47 million) Series A2 round. It has also published two papers, in June and this month, on how its architecture will scale to fault-tolerant quantum computation.

First machine, running at room temperature. In July 2026 OptQC unveiled MoQuren, its first optical quantum computer, at the Global Research and Development Center for Business by Quantum-AI technology (G-QuAT) of the National Institute of Advanced Industrial Science and Technology (AIST). MoQuren operates at room temperature and atmospheric pressure, with no cryogenic cooling. It is a step toward SystemO, part of AIST’s ABCI-Q quantum-classical hybrid computing infrastructure. OptQC plans to offer computing services to companies and research institutions, and a free SDK with a simulator is in development.

NTT alliance and Series A2. In August OptQC and NTT, Inc. signed a capital and business alliance aimed at a fault tolerant optical quantum computer with one million qumodes (the optical equivalent of physical qubits) by fiscal 2030. Joint research through fiscal 2027 covers scaling the number of qumodes with wavelength-division multiplexing, the design of a fault-tolerant optical quantum computer, and the architecture of a million-qumode-class system. A system of roughly 10,000 qumodes is planned for proof-of-concept projects with users from fiscal 2028. Target applications include finance, manufacturing, drug discovery, new materials, energy optimization and AI. NTT then led OptQC’s JPY 7.0 billion Series A2 with 21 investors, bringing cumulative funding, including public R&D grants, to over JPY 20 billion (approx. US$133 million). The proceeds fund a next-generation processor targeting about 10,000 qumodes and roughly 100 times the computing performance of the first system, while keeping room-temperature operation.

Research: a modular blueprint for fault tolerance. In “Modular optical fault-tolerant quantum computation via an interface between verified resources and online logical operations” (arXiv:2610.32838), OptQC researchers address a basic problem in fault tolerance. In conventional designs, stronger error protection tends to mean more processing steps in the computation itself. The paper proposes an architecture in which the error-correction resource states are generated and verified in an offline resource unit, separate from the online logical operations. The paper shows a construction in which, with resources prepared in advance and processed in parallel, protection can be strengthened without increasing the depth of the online computation, and numerical analysis confirms that stronger offline protection lowers the logical error rate. Error correction can therefore be strengthened, or a different code considered, while keeping the same optical processor.

Research: removing the electronic bottleneck from feedforward. Measurement-based optical quantum computers rely on feedforward: the result of measuring one part of an entangled state steers the next operation. Today that loop runs through detectors and electronics, which caps the clock rate and adds latency. In “All-optical Implementation of Generalized Quantum Teleportation” (arXiv:2606.22736), an OptQC team proposes a loss-tolerant all-optical feedforward architecture that performs arbitrary linear operations entirely in the optical domain. A noise analysis with realistic device parameters indicates that the design is compatible with the requirements of fault-tolerant computation.
Together, the two papers address two barriers to scaling optical quantum computers: strengthening error protection without deepening the computation, and freeing feedforward from the limits of electronics.

About OptQC Corp. OptQC Corp. is a deep-tech startup building sustainable, next-generation computing infrastructure powered by optical quantum technology. Founded in September 2024 on more than 25 years of research at the University of Tokyo’s Furusawa Laboratory, the Tokyo-based company takes an integrated approach to research, development and business to accelerate the practical application of quantum technology in global markets. Following a JPY 7.0 billion (approx. US$47 million) Series A2 round led by NTT, OptQC’s cumulative funding, including prior rounds and public grants, exceeds JPY 20.0 billion (approx. US$133 million).
Learn more at https://www.optqc.com/en.

Media contact: OptQC Corp. Public Relations, press@optqc.com

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