A superconducting surface-code processor with lattice-surgery logical operations

• URL: http://arxiv.org/abs/2606.06598v1
• Date: Thu, 04 Jun 2026 18:00:09 GMT
• Title: A superconducting surface-code processor with lattice-surgery logical operations
• Abstract summary: We show the experimental realization of lattice-surgery operations between a pair of distance-three surface-code logical qubits on a superconducting processor.<n>We deterministically prepare a logical Bell state, confirming genuine bipartite entanglement via the error-corrected logical state fidelity.<n>We further execute a two-qubit Deutsch-Jozsa algorithm at the logical level to demonstrate algorithmic utility in a fault-tolerant framework.
• Score: 15.298176899530029
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Fault-tolerant logical operations are fundamental for scalable quantum computation. Here, we report the experimental realization of lattice-surgery operations between a pair of distance-three surface-code logical qubits on a planar superconducting processor. During repeated syndrome extraction cycles, the logical qubits exhibit per-cycle error rates of $0.0365(2)$ and $0.0282(1)$, respectively, after leakage events are rejected. By leveraging joint initialization and lattice splitting, we deterministically prepare a logical Bell state, confirming genuine bipartite entanglement via the error-corrected logical state fidelity. We further execute a two-qubit Deutsch-Jozsa algorithm at the logical level to demonstrate algorithmic utility in a fault-tolerant framework. Finally, to achieve universal control, we implement magic-state injection and gate teleportation to realize continuous non-Clifford rotations about the logical $X$ axis. For the logical $R_{X}(π/4)$ gate, we achieve a logical gate fidelity of $0.943_{-9}^{+10}$ conditioned on the absence of detected errors. These results establish lattice surgery as a practical and versatile paradigm for logical computation in near-term surface-code architectures, representing a critical milestone toward scalable fault-tolerant quantum advantage in superconducting circuits.

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