# IBM reports 99% average quantum state transfer between two processors

_Published Tuesday, October 27, 2026 at 8:11 AM EDT · Science · Latest · Tier 2 — Notable_

IBM researchers report connecting two Nighthawk R1 quantum processors with four links that transferred quantum states with 99% average fidelity. Each link used an 80-centimeter cable inside a dilution refrigerator, demonstrating multiple connections between full processor chips.

The team also used the links to perform operations between qubits on separate processors, achieving 94.75% average two-qubit gate fidelity across the four links. Two links operated simultaneously to create independent entangled states.

The experiment connected only a subset of the processors' qubits for development. IBM says further work includes improving link yield, reproducibility and error rates before integrating more connections into larger systems.

## Sources

- [IBM Research](https://research.ibm.com/blog/connecting-quantum-processors-with-l-couplers)

---
Canonical: https://techandbusiness.org/newswire/UCuBqN_y8it1T54CN5FYX6
Published: 2026-10-27T12:11:31.045Z
Story chronology: 2026-10-27T12:00:00.000Z
Retrieved: 2026-10-27T14:48:17.279Z
Publisher: Tech & Business (techandbusiness.org)