Infleqtion Strengthens Neutral-Atom Quantum Computing Platform with New Technical Breakthroughs

Advances new open-source resource estimation tool, record-breaking qubit performance and novel atom transport technology, marking latest milestones toward utility-scale quantum computing

Infleqtion (NYSE:INFQ), a global leader in quantum computing and quantum sensing powered by neutral-atom technology, today highlighted recent quantum computing advances that strengthen the company's progress toward utility-scale, fault-tolerant quantum computing: the release of resource-superstaq, a new open-source architecture-level resource estimation package; a record dual-species rubidium-cesium entangling gate; a new theory preprint co-authored by Professor Mark Saffman, Infleqtion's Chief Scientist for Quantum Information, showing a path to neutral-atom entangling-gate fidelity beyond 99.9%; and a static magnetic-field approach to sub-Doppler cooling and optical atom transport.

Together, the advances demonstrate the strength of Infleqtion's full-stack approach to neutral-atom quantum computing, combining hardware-aware software, quantum error correction-enabling architectures, high-fidelity dual-species operations, gate-design theory for lower physical error rates, and scalable atom motion. By tightly coupling hardware development, quantum error correction, resource estimation, compilation and application design, Infleqtion is working to shorten the timeline to transformative quantum computing. The announced capabilities are designed to reduce resource overhead, support more efficient magic-state production, advance high-fidelity entangling operations, and enable fast, in-place syndrome measurement for scalable fault-tolerant systems.

"What's notable about these breakthroughs is that we're moving the needle on quantum software, hardware and theory simultaneously. Each of these advances represents a distinct layer of the quantum stack, from how we move atoms to how well our qubits perform to how developers interact with our systems," said Pranav Gokhale, Chief Technology Officer and General Manager of Quantum Computing of Infleqtion. "Neutral atoms give us a uniquely flexible platform to do that since progress in one layer unlocks progress in the others. Collectively, these breakthroughs show how we're building the entire foundation needed to unlock utility-scale quantum computing."

Open-Source Resource Estimation for Fault-Tolerant Application Planning

Infleqtion has open-sourced resource-superstaq, the newest addition to the suite of tools and packages within Infleqtion's commercial Superstaq quantum software platform. The technical preprint is available at Resource Estimation via Efficient Compilation of Key Quantum Primitives.

Quantum resource estimation is a critical element of modern quantum application development, enabling developers to extrapolate the quantum computing resources, including qubit count and circuit runtime, needed to execute an application at scale. Comparing these estimates with publicly available hardware roadmaps is one of the most direct methods for evaluating timelines for commercial-scale quantum solutions.

The new open-source package provides a practical on-ramp for customers, collaborators and researchers preparing applications for Infleqtion's neutral-atom quantum computers. By estimating the resources required to execute fault-tolerant workloads on Infleqtion-relevant neutral-atom architectures, resource-superstaq gives users clearer insight into how their applications are expected to perform on Infleqtion systems, including projected qubit requirements, runtime and sensitivity to key compilation and error-correction assumptions. The tool also supports Infleqtion's hardware and architecture development by helping evaluate how design choices such as atom movement, measurement zones, multi-species arrays and QEC implementation strategies affect application-level performance.

Because implementation and evaluation of neutral-atom hardware design decisions require substantial theoretical modeling and device engineering, resource-superstaq is designed to support a rapid design iteration cycle. The tool enables Infleqtion to efficiently explore the design space for fault-tolerant neutral-atom quantum computers and pair effective physical architectures and QEC-enabling middleware with high-impact applications.

By making resource-superstaq openly available, Infleqtion is giving customers, collaborators and the broader quantum research community a clearer view into how fault-tolerant quantum applications will perform on neutral-atom systems. The release allows users to explore the assumptions behind resource estimates, test the tool against their own workloads, and contribute improvements that expand its usefulness over time. This open, collaborative approach is intended to accelerate application readiness, strengthen confidence in resource estimates, and help the ecosystem make more informed decisions as the industry advances toward fault-tolerant quantum computing.

Development of resource-superstaq was performed in collaboration with the University of Chicago.

"Resource estimation only means something if it reflects how the hardware actually works. That's what makes this collaboration with Infleqtion so valuable," said Professor Fred Chong of the University of Chicago. "Resource-superstaq is built around the real characteristics of Infleqtion's neutral-atom systems, which means the estimates it produces are ones the research community can actually test, challenge, and build on. Enabling researchers to validate the assumptions behind a resource estimate is one of the best ways we can accelerate the path to fault-tolerant quantum computing."

Record Dual-Species Rb-Cs Gate Fidelity for In-Place Syndrome Measurement

Infleqtion researchers also demonstrated what the company believes is a world-record dual-species rubidium-cesium entangling gate fidelity in a neutral-atom quantum computing platform. The work, described in Qubit syndrome measurements with a high fidelity Rb-Cs Rydberg gate, reports an inter-species Rydberg gate between Rb and Cs atoms with world-record fidelity of 0.975 ± 0.002.

The dual-species architecture is a key element of Infleqtion's roadmap because it enables fast, in-place quantum non-demolition qubit measurements for quantum error correction. By using different atomic species for data and ancilla qubits, Infleqtion's approach can perform measurement operations with reduced disturbance to nearby data qubits, helping avoid additional movement or shelving operations that can slow logical cycle rates and add error.

The same work demonstrates multi-atom error syndrome measurements on two- and three-qubit plaquettes, core building blocks for surface-code quantum error correction. Infleqtion's architecture combines fast in-place syndrome measurement enabled by the dual-species approach with in-place atom addressing and atom motion capabilities, creating a flexible platform for the physical operations required by fault-tolerant neutral-atom systems.

New Theory Work Shows Path to >99.9% Neutral-Atom Entangling Gates

Complementing Infleqtion's experimental dual-species gate result, a new theory preprint from the University of Wisconsin-Madison, co-authored by Professor Mark Saffman, Infleqtion's Chief Scientist for Quantum Information, identifies a path to improving neutral-atom entangling gate fidelities beyond 99.9%. The paper, Entangling gate performance and fidelity limits with neutral atom Förster resonances, outlines how refinements to Rydberg gate design could significantly improve one of the core building blocks required for fault-tolerant quantum computing.

High-fidelity entangling gates are essential to reducing the overhead required for quantum error correction. By showing a credible path to lower physical error rates, the new theory work complements Infleqtion's recent hardware progress and supports the company's broader roadmap toward scalable, fault-tolerant neutral-atom quantum computers.

The result also highlights one of the key advantages of neutral-atom systems: the ability to combine high-fidelity operations, flexible connectivity and scalable architectures in a platform designed for quantum error correction. Together with Infleqtion's dual-species gate demonstration, resource estimation tools and atom motion advances, the work strengthens the case for neutral atoms as a leading path toward utility-scale quantum computing.

"This work demonstrates a credible path toward entangling-gate fidelities beyond 99.9%, an important milestone for scaling reliable quantum systems," said Professor Mark Saffman, Chief Scientist for Quantum Information at Infleqtion. "Continued advances in gate performance can significantly reduce the overhead associated with quantum error correction and help accelerate the development of commercially useful quantum computers."

Static Magnetic-Field Atom Transport for Scalable Neutral-Atom Architectures

Infleqtion also announced a new static magnetic-field technique for sub-Doppler cooling and optical transport of cesium atoms, described in Sub-Doppler laser cooling and optical transport of cesium with static magnetic fields. The result establishes a more effective approach for atom motion, a critical capability for neutral-atom quantum computing architectures.

Neutral-atom systems rely on the ability to prepare, move and arrange atoms while preserving coherence and minimizing operational complexity. Conventional alkali atom cooling often requires time-varying magnetic fields, which can introduce unwanted coupling between atom preparation and coherent operations. Infleqtion's static-field approach enables sub-Doppler cooling and optical transport of cesium while keeping the magnetic-field gradient unchanged.

In the reported demonstration, Infleqtion achieved 17 μK temperatures, direct loading into a shallow optical lattice, and optical transport over 17 cm within the same static-field environment. The work supports continuous-operation architectures by spatially separating atom preparation from regions requiring long coherence times and by delivering millions of atoms per second to a science cell.

Webinar to Present and Discuss Results

Infleqtion will host a webinar on June 24, 2026 at 10:00am MDT to present its recent results and discuss their implications for fault-tolerant neutral-atom quantum computing, resource estimation, quantum error correction, high-fidelity entangling-gate design and scalable atom motion. Registration is available here.

About Infleqtion

Infleqtion, Inc. (NYSE:INFQ) is a global leader in quantum technology, delivering neutral-atom solutions for quantum computing, networking, sensing, and security. With a product portfolio spanning quantum computers, quantum optical clocks, RF receivers, and inertial sensors, Infleqtion's full-stack approach combines high-performance hardware with the company's proprietary Superstaq quantum computing software platform. Infleqtion's systems are already in use by the U.S. Department of Defense, NASA, the U.K. government, and in multiple collaborations with NVIDIA. With operations in the U.S., Europe, and Asia, Infleqtion meets the demands of government and commercial customers across the space, defense, energy, finance and telecommunications sectors.

For more information, visit Infleqtion.com or follow Infleqtion on LinkedIn, YouTube, and X.

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