Japan Powers First Room‑Temperature Quantum Computer, Sets 10,000‑Qubit Goal by 2031

Japanese researchers have activated Shunkai, the nation’s inaugural full‑stack room‑temperature quantum computer built on neutral‑atom technology.

Scaling Shunkai to a room‑temperature quantum computer with ↑ 10,000 qubits

Unlike superconducting chips that demand millikelvin chillers, Shunkai traps individual atoms in vacuum using optical tweezers, allowing operation at ambient conditions. Microwaves and laser pulses flip atomic states, while a camera reads fluorescence to extract results.

The system launches with roughly 50 qubits, slated to reach 500 before a 2031 milestone targets a fault‑tolerant array of ↑ 10,000 physical qubits equipped with error‑detection protocols.

“Shunkai will ripple across industry, academia and government worldwide,” said Kenji Ohmori, project lead at the Institute for Molecular Science.

Ohmori envisions a hybrid quantum‑GPU centre that plugs Shunkai into Japan’s shared supercomputing network, giving external scientists a sandbox for algorithm development. Quantum error correction—the process of encoding redundancy to survive the ↓ 1,000‑to‑1 error odds of raw qubits—will be stress‑tested on the platform.

Neutral‑atom arrays have already demonstrated 6,100 qubits in a Caltech experiment (Oct 2025). Japan’s push aims to eclipse that record, positioning the country at the forefront of a modality many see as the next leap beyond superconductors. For broader context, see Reuters and Bloomberg.