Quantum error detection in qubit-resonator star architecture

• URL: http://arxiv.org/abs/2503.12869v2
• Date: Thu, 10 Apr 2025 11:39:48 GMT
• Title: Quantum error detection in qubit-resonator star architecture
• Authors: Florian Vigneau, Sourav Majumder, Aniket Rath, Pedro Parrado-Rodríguez, Francisco Revson Fernandes Pereira, Stefan Pogorzalek, Tyler Jones, Nicola Wurz, Michael Renger, Jeroen Verjauw, Ping Yang, Hsiang-Sheng Ku, William Kindel, Frank Deppe, Johannes Heinsoo,
• Abstract summary: We encode two logical qubits in a star-topology superconducting QPU.<n>We measure logical state fidelities above 96 % for every cardinal logical state.<n>The presented QPU configuration can be used to enable qubit-count efficient QEC codes.
• Score: 5.1474924705769185
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Achieving industrial quantum advantage is unlikely without the use of quantum error correction (QEC). Other QEC codes beyond surface code are being experimentally studied, such as color codes and quantum Low-Density Parity Check (qLDPC) codes, that could benefit from new quantum processing unit (QPU) architectures. Star-topology offers effective all-to-all connectivity in comparison to the square-grid topology and thus enables more hardware efficient implementation of some QEC codes. We encode two logical qubits in a star-topology superconducting QPU using the [[4,2,2]] code and characterize the logical states with the classical shadow framework. Logical life-time and logical error rate are measured over repeated quantum error detection cycles for various logical states including a logical Bell state. We measure logical state fidelities above 96 % for every cardinal logical state, find logical life-times above the best physical element, and logical error-per-cycle values ranging from from 0.25(2) % to 0.91(3) %. The presented QPU configuration can be used to enable qubit-count efficient QEC codes via the high connectivity in future devices.

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