IBM announced detailed plans today to build an error-corrected quantum computer with significantly more computational capability than existing machines by 2028. It hopes to make the computer available to users via the cloud by 2029. 

The proposed machine, named Starling, will consist of a network of modules, each of which contains a set of chips, housed within a new data center in Poughkeepsie, New York. “We’ve already started building the space,” says Jay Gambetta, vice president of IBM’s quantum initiative.

IBM, along with the rest of the industry, has years of work ahead. But Gambetta thinks it has an edge because it has all the building blocks to build error correction capabilities in a large-scale machine. That means improvements in everything from algorithm development to chip packaging. “We’ve cracked the code for quantum error correction, and now we’ve moved from science to engineering,” he says. 

Correcting errors in a quantum computer has been an engineering challenge, owing to the unique way the machines crunch numbers. Whereas classical computers encode information in the form of bits, or binary 1 and 0, quantum computers instead use qubits, which can represent “superpositions” of both values at once. IBM builds qubits made of tiny superconducting circuits, kept near absolute zero, in an interconnected layout on chips. Other companies have built qubits out of other materials, including neutral atoms, ions, and photons.

Quantum computers sometimes commit errors, such as when the hardware operates on one qubit but accidentally also alters a neighboring qubit that should not be involved in the computation. These errors add up over time. Without error correction, quantum computers cannot accurately perform the complex algorithms that are expected to be the source of their scientific or commercial value, such as extremely precise chemistry simulations for discovering new materials and pharmaceutical drugs. 

But error correction requir...