Will **quantum computing** achieve the milestone of a stable, error-corrected **100-qubit system** before the end of 2027?

The Quantum Leap: From Physical Qubits to Logical Qubits by 2027

The development of quantum computing is often tracked by the raw number of **physical qubits** (currently in the thousands). However, the true measure of a useful quantum computer lies in its **logical qubits**—stable, error-corrected units capable of running complex algorithms. This prediction focuses on achieving **100 logical, error-corrected qubits** by the end of 2027, a milestone that would push quantum computation beyond the limits of classical simulation.

The Error Correction Challenge

Qubits are highly fragile; their state collapses easily due to environmental 'noise.' To solve this, **Quantum Error Correction (QEC)** is necessary, where **many** unreliable physical qubits are combined to create **one** reliable logical qubit. The overhead is massive. Experts, like those at Riverlane and QuEra, estimate that tens of thousands of physical qubits may be needed to support just 100 logical qubits.

The good news is that companies like **QuEra Computing** have already set aggressive roadmaps, targeting a **100-logical-qubit system by 2026**, supported by over 10,000 physical qubits. While timelines in quantum computing are notoriously difficult to maintain, the sheer global investment and the specific, engineering-focused nature of the goal suggest that 2027 is a highly realistic target for demonstrating this critical technology. This breakthrough would finally usher in the era of 'Fault-Tolerant Quantum Computing.'