Quantum computing
Qubits, error correction and the race to build useful quantum computers.
- WikiDARPA Quantum Benchmarking Initiative (QBI)DARPA's Quantum Benchmarking Initiative tests whether any quantum computer can reach utility scale by 2033. Its stages, teams and October 2026 Stage C.Updated
- WikiGoogle WillowWillow is Google Quantum AI's 105-qubit superconducting chip, used for the first below-threshold error correction and the Quantum Echoes experiment.Updated
- WikiIBM QuantumIBM Quantum builds superconducting quantum computers. Its Nighthawk and Loon chips, 2026 advantage claims and the 2029 fault-tolerant Starling plan.Updated
- WikiNeutral-atom qubitsNeutral-atom quantum computers trap thousands of atoms with laser tweezers. How they work, the 448-atom and 6,100-atom milestones, and who builds them.Updated
- WikiQuantinuumQuantinuum builds trapped-ion quantum computers, including the 98-qubit Helios. Its fidelity records, logical-qubit results and DARPA status.Updated
- WikiSuperconducting qubitsSuperconducting qubits are chip-based circuits cooled near absolute zero, used by Google, IBM and USTC. How they work and where they stand in 2026.Updated
- WikiSurface codeThe surface code is the leading quantum error-correcting code for chip-based qubits. How it works, its 2024 below-threshold result and its limits.Updated
- WikiTopological qubitsTopological qubits would store quantum information in exotic states of matter. Microsoft's Majorana 1 claim, the scientific dispute and DARPA's review.Updated
- WikiTrapped-ion qubitsTrapped-ion qubits use charged atoms held in electromagnetic fields. Why they lead on gate fidelity, who builds them, and their 2026 milestones.Updated
- AnalysisHas quantum advantage arrived? The 2026 debateQuantum advantage claims from Google, USTC and IBM, why classical computers keep catching up, and what would settle the debate.Updated
- ExplainerHow qubits workWhat a qubit is, how superposition, entanglement and interference power quantum computers, and why qubits are so fragile.Updated
- ExplainerQuantum error correction: from noisy to logical qubitsHow quantum error correction turns many noisy physical qubits into reliable logical qubits, what "below threshold" means, and the 2026 state of play.Updated
- ExplainerWhat quantum computers are good for (and what they are not)The problems quantum computers are expected to help with - simulation, cryptanalysis - how close each is, and why "faster at everything" is wrong.Updated