SOURCE QuEra Computing

Landmark experiment delivers a key building block for universal, fault-tolerant quantum computing

BOSTON, July 14, 2025 /PRNewswire/ -- A team of scientists from QuEra Computing, Harvard University and the Massachusetts Institute of Technology has reported the first experimental demonstration of magic state distillation carried out entirely on logical qubits. The study, "Experimental Demonstration of Logical Magic State Distillation," is now available as Accelerated Article Preview on the Nature website at: https://www.nature.com/articles/s41586-025-09367-3

Quantum computers use qubits and quantum logic operations to process information and execute algorithms. The central challenge is executing quantum logic with a very low error rate to realize complex, practically useful quantum algorithms. In principle, this is possible using encoded logical qubits - qubits protected by layers of error-correcting code. However, most quantum error-correcting codes allow only certain types of basic logical operations - known as Clifford gates - to be executed. While Clifford gates form the backbone of many quantum circuits, they are not sufficient to realize universal quantum computing, which refers to the capability of a quantum computer to perform any computation that is theoretically possible within the quantum model. In fact, quantum computers that use only Clifford gates can be readily simulated on classical computers.

To realize their full potential, quantum machines must also generate and use special high-quality resource states, aptly named magic states. When produced at the logical level with low errors, such states are perhaps the most essential ingredients for universal, fault-tolerant quantum computation. They are also among the most resource-intensive to generate, produced inside so-called magic state factories using advanced quantum protocols such as magic state distillation. The high cost and complexity of producing magic states is one of the key barriers to scaling fault-tolerant systems.

For readers without background in quantum physics, think of magic state distillation as the quantum equivalent of refining crude oil into aviation fuel: it transforms the fragile, noisy raw materials produced by today's quantum systems into the high-octane resource required to run any quantum algorithm reliably. Raw magic states are imperfect, so engineers combine multiple copies and "distill" the batch into a single, cleaner version.

The new study demonstrates that the entire magic state distillation process can now be performed within the logical layer, keeping the precious output protected from hardware faults, ready for use in a full set of computations on logical qubits. Generating high-quality magic states within the error-corrected layer opens the door to executing full quantum programs entirely within the protected logical space-an essential capability for scaling to practical quantum applications.

Using QuEra's Gemini neutral-atom computer, the team first grouped individual atoms into error-protected logical qubits. They created two sizes of these logical bundles-known as distance-3 and distance-5 color-code qubits-and then ran a 5-to-1 distillation protocol that distilled five imperfect magic states into a single, cleaner one. The result: the fidelity of the final magic state exceeded that of any input, proving that fault-tolerant magic state distillation is not just a theory-it works in practice.

"Logical magic-state distillation has been a long-standing milestone on the road to universal quantum computing," said Dr Sergio Cantu, corresponding author and Vice President of Quantum Systems at QuEra. "Our results show that neutral-atom processors can now orchestrate dozens of logical qubits in parallel, suppress errors quadratically, and generate the high-quality magic states needed for large-scale algorithms."

Dr Takuya Kitagawa, President of QuEra, added: "Scalable fault tolerance for universal quantum computations is the central challenge of quantum information science. Demonstrating a logical magic-state factory on our Gemini platform confirms both the flexibility of neutral atoms and our roadmap toward error-corrected, application-ready machines."

Prof. Mikhail Lukin of Harvard University, co-founder and Chief Scientist of QuEra commented: "This experiment leverages the unique strengths of neutral-atom arrays-dynamic reconfiguration and all-to-all entanglement-to tackle one of the most demanding sub-routines in quantum error correction. It is a very important step toward practical, universal quantum processors."

Why It Matters
This demonstration is significant for several reasons:

  • Unlocks universality for logical qubits: Magic states supply the resource for non-Clifford gates, completing the otherwise Clifford-only toolkit and giving logical qubits a fully universal-and classically intractable-gate set. Without non-Clifford gates, quantum circuits can be efficiently simulated on a laptop, as stated by the Gottesman-Knill theorem, which means no quantum speed-up is possible.
  • Demonstrates logical-level error suppression: performing distillation on error-corrected qubits - rather than on raw physical qubits - delivers quadratic suppression of logical errors-a prerequisite for deep, fault-tolerant circuits.
  • Showcases high level of parallelism: building on earlier ground-breaking demonstration of logical quantum processing at Harvard and MIT, Gemini's optical-control system can address and move many atoms at once, so multiple logical qubits evolve in parallel. This shortens circuit depth, reduces idle errors, and keeps the "magic-state factory" fast enough for large-scale algorithms.
  • Illustrates the scalability of QuEra's neutral-atom architecture: The experiment manipulated five distance-5 logical qubits and re-arranged them mid-circuit, illustrating the platform's path to hundreds of logical qubits.

Experimental Highlights
The experiment demonstrates several key capabilities:

  • Parallel logical encoding: Executed two simultaneous distance-3 magic state factories.
  • 5-to-1 magic-state distillation: Implemented a three-layer distillation circuit using transversal Clifford gates and atom transport; success was flagged by four logical syndrome qubits.
  • Dynamic reconfiguration: Leveraged the reconfigurable architecture to flexibly implement the complex connectivity required by the full circuit.

Webinar
A public webinar with several of the paper's authors-part of the Science with QuEra series-will take place on Wednesday, August 6th at 11 AM ET. Register at https://quera.link/magic.

Funding & Acknowledgements
This work received support from IARPA, the U.S. Army Research Office, the DARPA ONISQ and MeasQuIT programs, the National Science Foundation, and the Center for Ultracold Atoms.

About QuEra Computing
QuEra Computing is the leader in developing and productizing quantum computers using neutral atoms, widely recognized as a highly promising quantum computing modality. Based in Boston and built on pioneering research from Harvard University and MIT, QuEra operates the world's largest publicly accessible quantum computer, available over a major public cloud and for on-premises delivery. QuEra is developing useful, scalable and fault-tolerant quantum computers to tackle classically intractable problems, becoming the partner of choice in the quantum field. For more information, please visit quera.com and follow QuEra on X or LinkedIn.

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