Quantum Circuits, Inc.
Building quantum computers designed to scale
77 employees · est. 2015 · New Haven, United States
Quantum Machines
Accelerating the Realization of Practical Quantum Computers
237 employees · est. 2018 · Claymont, United States
Quantum Circuits, Inc. is the older company (2015 vs 2018); Quantum Machines is the larger of the two.
Side-by-Side Comparison
| Metric | Quantum Circuits, Inc. | Quantum Machines |
|---|---|---|
| Founded | ||
| Founded | 2015 older | 2018 |
| Headquarters | ||
| Headquarters | New Haven, United States | Claymont, United States |
| Employees | ||
| Employees | 77 | 237 larger |
| Industry | ||
| Industry | IT, Manufacturing, Quantum | Quantum |
| Funding Stage | ||
| Funding Stage | Acquired | Series C |
| Total Funding | ||
| Total Funding | $654.50M | $363.00M |
| Funding Rounds | ||
| Funding Rounds | 6 | 7 |
| Services | ||
| Services | Quantum Error Detection, Real-Time Control Flow, Error Detection Handling, Development of Quantum Algorithms, Quantum Application Hosting | Quantum Computing Control and Electronics Solution from Room Temperature to Cryogenics |
| Target Customers | ||
| Target Customers | Quantum Researchers, Tech Companies, Developers in Quantum Computing, Businesses Exploring Quantum Solutions, Academic Institutions in Quantum Studies, Innovation-focused Enterprises | Full-stack quantum computing vendors, HPC centers, and leading quantum research labs |
| Taxonomy | ||
| Taxonomy | Quantum Computing, Superconducting Devices, Quantum Circuits, Error Correction, Scalable Architecture, Quantum Algorithms, Full-Stack Platform, Modular Architecture, Fault Tolerant Quantum Computing, Quantum Software, Quantum Hardware, Dual-Rail Qubit, Quantum Electrodynamics, RF Engineering, Mechanical Engineering | Quantum Computing, Quantum Control, Quantum Orchestration Platform, Quantum Software, Quantum Hardware, Quantum Electronics, Quantum System Development, Quantum Technology, Engineering Solutions, Multidisciplinary Team, Electrical Engineering, RF Microwave Engineering, Algorithmics, Digital Signal Processing |
| Website | ||
| Website | quantumcircuits.com | quantum-machines.co |
About Quantum Circuits, Inc.
Quantum Circuits, Inc., headquartered in the United States, is at the forefront of the quantum computing revolution, developing a full-stack platform tailored for scalability using superconducting devices. Founded in 2015, the company's mission is encapsulated in its slogan: "Building quantum comput...
About Quantum Machines
Quantum Machines, founded in 2018, is spearheading the evolution of quantum computing from its headquarters in the United States. With the slogan, "Accelerating the Realization of Practical Quantum Computers," the company is on a mission to revolutionize industries by harnessing quantum technology....
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Funding, hiring, leadership and stack changes at Quantum Circuits, Inc. and Quantum Machines — by email.
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Compiled from the BounceWatch company index. We last looked at Quantum Circuits, Inc. on 2 Mar 2026, and Quantum Machines on 20 Oct 2025. Where a field is blank here, it means we have not recorded it — not that the answer is zero. How we source and date this.