IonQ has published a detailed blueprint for a fault-tolerant quantum computer, outlining a design it says could move the field beyond its current experimental limits and into practical use. The architecture, described in an arXiv preprint earlier this month by researchers including Felix Tripier and Nicolas Delfosse, lays out a full-stack system capable of running millions of quantum operations on hundreds of logical qubits. The company argues that its design relies only on hardware techniques already demonstrated in laboratories, positioning it as a near-term engineering challenge rather than a distant theoretical goal. Currently, most quantum computers fall into the category of noisy intermediate-scale quantum (NISQ) devices. These systems can perform thousands of operations, but errors accumulate quickly. Consequently, they struggle to solve problems of industrial or scientific importance. The IonQ team proposes a different approach. Instead of simply increasing qubit counts, it restructures the entire system architecture. Additionally, it integrates error correction, computation and hardware control into a unified design. At the core of the issue lies quantum noise. Every operation on a qubit introduces a small chance of error. Over time, these errors compound and degrade results. Fault-tolerant systems address this limitation by encoding information across many physical qubits. In this framework, a single logical qubit spreads its information across multiple physical units. Consequently, the system can detect and correct errors before they cascade. IonQ’s blueprint uses quantum low-density parity-check codes, or LDPC codes, to achieve this. These codes rely on sparse connections between qubits. As a result, they require fewer physical qubits than older approaches such as surface codes. Read more: IonQ sparks Italy’s quantum renaissance through Q-Alliance partnership Read more: IonQ closes Skyloom acquisition to accelerate quantum-secure networking push Architecture includes processes for distillation Additionally, the architecture introduces specialized components to manage quantum resources. One of these