Infleqtion is demonstrating significant advances in neutral-atom quantum computing, with a new theory co-authored by Infleqtion’s Chief Scientist for Quantum Information, Professor Mark Saffman, revealing a path to achieving fidelity in entangling gates exceeding 99.9%. This level of precision potentially surpasses current limitations and represents a critical step toward building practical quantum computers. Alongside this theoretical breakthrough, Infleqtion has achieved a record dual-species rubidium-cesium entangling gate and released resource-superstaq, a new open-source tool for estimating the resources needed for fault-tolerant quantum applications. “What’s notable about these breakthroughs is that we’re moving the needle on quantum software, hardware and theory simultaneously,” said Pranav Gokhale, Chief Technology Officer and General Manager of Quantum Computing of Infleqtion; the company’s full-stack approach aims to accelerate the timeline to transformative quantum computing.
resource-superstaq Enables Fault-Tolerant Application Planning
Quantum resource estimation is vital for developers seeking to extrapolate qubit counts and circuit runtime required to execute applications at scale, allowing comparison with existing hardware roadmaps to assess timelines for viable quantum solutions. This new package is not simply a theoretical exercise; it provides a practical on-ramp for users preparing applications for Infleqtion’s neutral-atom quantum computers, offering insight into projected qubit requirements and runtime. The tool’s utility extends beyond external users, supporting Infleqtion’s internal hardware and architecture development by evaluating how design choices, such as atom movement and quantum error correction implementation, affect application performance.
Because evaluating neutral-atom hardware demands extensive theoretical modeling, resource-superstaq is designed to accelerate the design iteration cycle, allowing efficient exploration of fault-tolerant computer designs. “Resource estimation only means something if it reflects how the hardware actually works,” said Professor Fred Chong of the University of Chicago. “That’s what makes this collaboration with Infleqtion so valuable.” He further explained that the tool’s grounding in Infleqtion’s systems allows the research community to test, challenge, and build on the estimates it produces. By open-sourcing resource-superstaq, Infleqtion aims to foster a collaborative environment, giving customers and researchers a transparent view into fault-tolerant application performance on neutral-atom systems. Users can explore the assumptions behind resource estimates, test the tool with their own workloads, and contribute improvements, accelerating application readiness and strengthening confidence in projections.
This collaborative approach is intended to help the quantum ecosystem make informed decisions as the industry progresses toward fault-tolerant quantum computing, and builds upon work performed in collaboration with the University of Chicago. The company stated that 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.
Record Rb-Cs Entangling Gate Fidelity for Syndrome Measurement
Infleqtion is advancing neutral-atom quantum computing with improvements in gate fidelity and error correction, building on the current challenge of achieving sufficiently low error rates. While many quantum computing modalities strive for fault tolerance, Infleqtion’s recent results demonstrate tangible progress toward that goal, specifically in the precision of entangling operations and the ability to measure qubit errors without disrupting quantum states. A key element of this progress is the demonstrated record dual-species rubidium-cesium entangling gate fidelity, reported in the work Qubit syndrome measurements with a high fidelity Rb-Cs Rydberg gate, achieving a fidelity of ±. This represents a significant leap in operational capability for the company’s platform and a crucial step toward scalable quantum systems. The significance of this dual-species approach lies in its potential to accelerate quantum error correction.
By utilizing rubidium and cesium atoms as data and ancilla qubits respectively, Infleqtion aims to perform qubit measurements in-place, meaning without physically moving the qubits, thereby minimizing disturbance and maintaining coherence. “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,” explains the company. This in-place measurement capability, combined with atom addressing and motion control, creates a versatile platform for the complex physical operations required by fault-tolerant systems.
Published as a preprint, Entangling gate performance and fidelity limits with neutral atom Förster resonances details how refining Rydberg gate design could substantially lower physical error rates. “This work demonstrates a credible path toward entangling-gate fidelities beyond 99.9%, an important milestone for scaling reliable quantum systems,” said Professor Saffman. “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.” The demonstrated multi-atom error syndrome measurements on two- and three-qubit plaquettes, core components for surface-code quantum error correction, further validates the viability of this approach.
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.
Pranav Gokhale, Chief Technology Officer and General Manager of Quantum Computing of Infleqtion
Theory Predicts >99.9% Fidelity for Neutral-Atom Entangling Gates
Infleqtion is advancing quantum gate fidelity with new theoretical work co-authored by Professor Mark Saffman, the company’s Chief Scientist for Quantum Information. Published as a preprint from the University of Wisconsin-Madison, the research details a pathway to achieving neutral-atom entangling-gate fidelities beyond 99.9%, a threshold considered vital for practical fault-tolerant quantum computation. This theoretical advance builds upon Infleqtion’s recent experimental successes and reinforces the potential of neutral-atom platforms to deliver scalable quantum systems. The core of the work focuses on refining Rydberg gate design, a critical component in building high-fidelity quantum operations. The combination of experimental validation and theoretical prediction creates a powerful synergy, allowing for a more informed and efficient approach to hardware development.
Infleqtion emphasizes that neutral-atom systems offer a unique advantage: the ability to integrate high-fidelity operations, flexible connectivity, and scalable architectures specifically designed for quantum error correction. The company’s release of resource-superstaq, an open-source architecture-level resource estimation package, complements these hardware and theoretical advances. By providing tools to accurately assess the resources needed for fault-tolerant workloads, Infleqtion aims to accelerate application development and foster collaboration within the quantum computing community.
This work demonstrates a credible path toward entangling-gate fidelities beyond 99.9%, an important milestone for scaling reliable quantum systems.
Professor Mark Saffman, Chief Scientist for Quantum Information at Infleqtion
Full-Stack Approach Advances Neutral-Atom Quantum Computing
Infleqtion is aggressively pursuing a comprehensive, “full-stack” strategy to overcome hurdles in neutral-atom quantum computing, integrating advancements across software, hardware, and theoretical understanding to accelerate the path toward practical quantum applications. Recent breakthroughs detailed by the company demonstrate a commitment to addressing challenges at every layer of the quantum computing architecture, from atom manipulation to qubit performance and developer accessibility. A key component of this strategy is the release of resource-superstaq, a new open-source architecture-level resource estimation package designed to help developers plan for fault-tolerant workloads on neutral-atom systems. This tool allows users to project qubit requirements and runtime, offering crucial insight into application performance and informing hardware development decisions. The development of resource-superstaq was a collaborative effort with the University of Chicago, reflecting a broader industry trend toward open-source tools and shared knowledge.
A new theory preprint co-authored by Professor Mark Saffman, Infleqtion’s Chief Scientist for Quantum Information, shows a path to neutral-atom entangling-gate fidelity beyond 99.9%. Infleqtion researchers also demonstrated a record dual-species rubidium-cesium entangling gate fidelity in a neutral-atom quantum computing platform. These combined efforts underscore Infleqtion’s holistic approach to building a scalable and fault-tolerant quantum computing platform.
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.
Professor Mark Saffman, Chief Scientist for Quantum Information at Infleqtion
