Source: Ars Technica
Read more: https://arstechnica.com/science/2023/10 ... -computer/
Today, a startup called Atom Computing announced that it has been doing internal testing of a 1,180 qubit quantum computer and will be making it available to customers next year. The system represents a major step forward for the company, which had only built one prior system based on neutral atom qubits—a system that operated using only 100 qubits.
The error rate for individual qubit operations is high enough that it won't be possible to run an algorithm that relies on the full qubit count without it failing due to an error. But it does back up the company's claims that its technology can scale rapidly and provides a testbed for work on quantum error correction. And, for smaller algorithms, the company says it'll simply run multiple instances in parallel to boost the chance of returning the right answer.
Computing with atoms
Atom Computing, as its name implies, has chosen neutral atoms as its qubit of choice (there are other companies that are working with ions). These systems rely on a set of lasers that create a series of locations that are energetically favorable for atoms. Left on their own, atoms will tend to fall into these locations and stay there until a stray gas atom bumps into them and knocks them out.
Because the locations of atoms are set by the configuration of the lasers, it's possible to address each individually. Quantum information is stored in the nuclear spin, which is relatively impervious to the environment. While other types of qubits have coherence lifetimes that are just a fraction of a second, neutral atoms will often hold their state for tens of seconds. Because the nuclear spin doesn't readily interact with the environment, it's possible to pack the atoms closely together, allowing a relatively dense system.
