Japan's first full-stack neutral-atom quantum computer, Shunkai, is now operational

[Ridge]

Japan's Institute for Molecular Science announced this week that its first full-stack neutral-atom quantum computer, named Shunkai, is now up and running. The machine currently operates with roughly 50 qubits and was built through a collaboration between IMS, Hitachi, and Infleqtion under Japan's Moonshot R&D Program, with Hitachi handling the software stack and Infleqtion contributing the quantum processing unit itself.

Neutral atom quantum computing works by trapping individual atoms in place using tightly focused laser beams called optical tweezers, then manipulating those atoms with microwaves or laser light to perform calculations. Results get read out by observing fluorescence from each atom through a camera. The approach has some genuinely appealing properties compared to competing modalities, including room temperature operation without needing a dilution refrigerator, the ability to physically move atoms around during a computation to entangle arbitrary qubits with each other, and a fairly straightforward path to scaling up qubit counts over time.

The name itself carries some nice symbolism. Shunkai is an alternate reading of Harumi Shibukawa, the Edo period astronomer credited with developing Japan's first indigenous calendar system through precise calculations of celestial motion, a nod to the similarly precise control needed to manipulate quantum states on what physicists call the Bloch sphere.

The current 50 qubit system is just the starting point though. IMS plans to scale Shunkai up to around 500 qubits in the near term, and the project's broader roadmap targets 10,000 physical qubits with functioning quantum error detection and correction by March 2031. Parts of the system will be opened to outside researchers for algorithm development and error correction work well before that final milestone arrives, and there are also plans to eventually integrate Shunkai with IMS's existing supercomputer facility to create a combined quantum GPU hybrid computing center

Japan's Full-Stack Neutral-Atom Quantum Computer is Operationalthequantuminsider.com