Quantum

IBM Connects Two 120-Qubit Processors With 99% State-Transfer Fidelity

Read full article at source ↗

Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 27/10/2026, 09:04:25 UTC.

Briefings

IBM researchers successfully linked two 120-qubit Nighthawk R1 processors using four 80-centimeter superconducting cables, achieving state-transfer fidelities of 99% and 98.86%. The experiment demonstrated the first multichannel quantum interconnect between large superconducting processors, enabling operations and entanglement across chips. However, complete operations between processors averaged only 94.75% fidelity, and only a subset of qubits was wired for measurement, limiting scalability.

Key points

• IBM researchers connected two 120-qubit Nighthawk R1 processors using four 80-centimeter aluminum coaxial cables to bridge quantum modules.
• State-transfer fidelities reached 99% and 98.86%, while complete operations between processors averaged 94.75% fidelity.

Context

This study addresses the practical challenge of connecting separate quantum processors to build larger modular computers. The experiment represents the first demonstration of a multichannel quantum interconnect between large superconducting processors, moving beyond single-module experiments.

Limitations

Coverage is limited to two 120-qubit processors; only a subset of qubits was wired and measured. Complete operations between processors averaged 94.75% fidelity, below state-transfer performance. Uncertainty exists in qubit stability, magnetic shielding, and manufacturing requirements for scaling.

Generated by Bittrees-hosted qwen35-2b sha256:aaf42c8b7c3c on 27/10/2026, 10:23:20 UTC. Based on publisher-provided feed evidence; may not cover the full original article. Check the source for details.

View archived briefing on IPFS
bafybeif3kbfywpbpmx4v45uobphcn5t52qo2etxl75lx5hbjytb44aar4q