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The experiment teleports logical qubits encoded in surface codes up to distance 7 on a 125-qubit superconducting processor, with reported single-qubit fidelities of 99.94% and two-qubit fidelities of 99.64%. For readers tracking fault-tolerant quantum computing, the useful signal is the scaling: it shows that code-level operations such as teleportation can be run at larger code distances, not just on small proofs of concept. The claims are still bounded by the specific hardware and gate fidelities reported, so the work is a meaningful step rather than evidence that large-scale fault tolerance is near.

Source coveringQuantum Zeitgeist

Quantum teleportation works with a surface code up to distance 7

Quantum ZeitgeistOctober 27, 20266 min read

Researchers demonstrated successful quantum teleportation, transitioning surface codes on a superconducting processor up to a distance of 7, advancing fault-tolerant quantum computation.

Researchers from Zhejiang University and The Hong Kong University of Science and Technology (Guangzhou) have demonstrated the robust teleportation of a topological rotated surface code on a superconducting quantum processor containing 125 qubits. The team achieved this quantum teleportation with code distances up to 7, a new benchmark in scaling up this approach to quantum error correction. This work uses the surface code, a leading candidate for protecting quantum information, and supports distributed fault-tolerant quantum computation. The results help to understand simulating and using topological quantum matter on quantum devices. This advance used a 125-qubit superconducting processor to reliably teleport logical states encoded within a topological rotated surface code, a method designed to protect against the inherent errors of quantum systems. The experiment’s…

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