QuEra Computing announced on June 15, 2026, that Libra, which it calls its first fault-tolerant quantum computer, will be available on Amazon Braket starting in 2028. Amazon Braket is the cloud service through which Amazon Web Services (AWS) offers access to quantum computers. QuEra said it and AWS were expanding their multi-year strategic collaboration to bring QuEra’s fault-tolerant systems to AWS customers.
In its release, QuEra gave Libra “projected specs of over 256 error-corrected logical qubits and a logical error rate of 10⁻⁶,” or one error in a million. A logical qubit is a unit of quantum information spread across many physical qubits, here individual atoms, so that errors can be detected and corrected during a computation. A logical error rate is how often errors get past that correction.
In the same release, the company described Libra as a “megaquop-class system, meaning it is designed to perform on the order of one million reliable logical quantum operations.” QuEra and AWS presented every Libra specification as a target for 2028, and neither QuEra’s release nor AWS’s blog post gave the number of physical qubits the machine will use.
QuEra wrote that fault-tolerant machines are designed to run “longer, deeper, and more reliable computations than today’s noisy quantum systems.”
What the two companies said
In a blog post the same day, Eric Kessler, general manager of Amazon Braket, wrote that AWS will bring Libra to its customers by 2028. He described Libra as a device “capable of executing one million quantum operations over hundreds of logical qubits.” Kessler named quantum chemistry, high-energy physics, and materials simulation as its first scientific applications.
Andy Ory, QuEra’s chief executive, said in the release that “Libra brings fault-tolerant computing to the cloud at scale in 2028.” QuEra did not specify in the release whether the one-in-a-million error rate applies per logical operation, per logical qubit, or per round of error correction.
What QuEra has run so far
QuEra’s Aquila, an analog computer with 256 physical qubits, has been available on Braket since 2022. QuEra wrote that Aquila was the first neutral-atom quantum computer on the service.
In a neutral-atom machine, each qubit is a single atom held in place by a focused laser beam. In an analog machine, the atoms evolve under programmed interactions, with no sequence of logic gates. QuEra’s Gemini, a neutral-atom system with what the company calls logical-qubit capabilities, is installed alongside the ABCI-Q supercomputer in Japan.
QuEra said teams at the company and at its scientific founders’ labs at Harvard and MIT have demonstrated “the foundational capabilities behind the system” in eight peer-reviewed papers in Nature and Physical Review Letters. Among those capabilities, QuEra listed below-threshold error correction, “where errors shrink as systems scale.” It also listed sustained operation of “thousands of qubits” with continuous atom reloading, in which the machine replaces lost atoms during operation.
Citing those groups’ results, Kessler wrote that AWS believes there is now “a clear technical pathway to large-scale fault-tolerant quantum computers that coherently operate hundreds of logical qubits.” In his post, he linked four experiments by QuEra and its Harvard and MIT partners, along with three papers on more resource-efficient fault tolerance. One of the three is a preprint that its authors posted to arXiv in April 2026.
Before 2028
QuEra said it would keep building successive generations of fault-tolerant systems in-house before 2028 and would give strategic partners hands-on access to them ahead of broader release. Ory said in the release that later generations “will scale even further” and that QuEra would describe them in a roadmap webinar later in June.
AWS is also developing its own superconducting chip, Ocelot, based on what AWS calls cat-qubit architecture. A cat qubit is a superconducting circuit designed to suppress bit flips, errors that switch a qubit between 0 and 1. Kessler described that technology as “deeply complementary to Rydberg atoms,” the highly excited atoms that QuEra uses to make its qubits interact.
Update, November 13, 2026: QuEra now lists more than 10,000 physical qubits on its Libra page, which it linked in the June 15 release. On the same page, the company says Libra can “encode up to 256 logical qubits.” QuEra gives no date on the page. It gave no physical-qubit count in the release itself.
