https://techmonitor.ai/hardware/quantum/quantinuum-builds-fault-tolerant-logical-qubits

UK-based quantum computing company Quantinuum says it has used fault-tolerant logical qubits for the first time. Scientists in Japan used the trapped-ion quantum computer to calculate the ground state energy of the hydrogen molecule. This could take us towards the era of early fault tolerance and out of the current noisy quantum computing era, the company believes.

Current generation quantum computers are referred to by the acronym NISQ, which stands for noisy intermediate-scale quantum. The process of creating and manipulating qubits generates noise and leaves them prone to errors and this is true across all qubit types from photonics to the trapped-ion system used by Quantinuum. To solve the problem companies engage in software and hardware error mitigation, detection and correction. With enough physical noisy qubits, it is possible to generate a smaller number of useful, noise-free logical qubits.