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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.16292 |
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| _version_ | 1866915942386106368 |
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| author | Hung, Jimmy Shih-Chun Haim, Arbel Raha, Mouktik Kim, Gihwan Huang, Ziwen Chou, Ming-Han D'Ewart, Mitch Davis, Erik Mishra, Anurag Arriola, Patricio Arrangoiz Khalajhedayati, Amirhossein Hover, David Brandão, Fernando G. S. L. Clerk, Aashish A. Retzker, Alex Levine, Harry Painter, Oskar |
| author_facet | Hung, Jimmy Shih-Chun Haim, Arbel Raha, Mouktik Kim, Gihwan Huang, Ziwen Chou, Ming-Han D'Ewart, Mitch Davis, Erik Mishra, Anurag Arriola, Patricio Arrangoiz Khalajhedayati, Amirhossein Hover, David Brandão, Fernando G. S. L. Clerk, Aashish A. Retzker, Alex Levine, Harry Painter, Oskar |
| contents | Erasure qubits are a promising platform for implementing hardware-efficient quantum error correction. Realizing the error-correction advantages of this encoding requires frequent mid-circuit erasure checks that are fast, high-fidelity, and scalable. Here, we realize erasure detection with a hardware-efficient circuit consisting of a single readout resonator dispersively and symmetrically coupled to both transmons of a dual-rail qubit. We use this circuit to demonstrate single-shot erasure detection in 384 ns with minimal impact on the dual-rail logical manifold, achieving a residual error per check of $6.0(2) \times 10^{-4}$, with only $8(3) \times 10^{-5}$ induced dephasing per check, and an erasure error per check of $2.54(1)\times 10^{-2}$. The high degree of matched dispersive readout coupling ($χ$-matching) within the dual-rail qubit code space also allows us to realize a new modality: time-continuous erasure detection performed in parallel with single-qubit gates. Here we achieve a median $7.2 \times 10^{-5}$ error per gate with $< 1 \times 10^{-5}$ error induced by erasure detection. This demonstrates a reduction in erasure detection overhead as well as a crucial ingredient for soft information quantum error correction. Together, these results establish symmetrically coupled dispersive readout as a fast, hardware-efficient, and scalable component for erasure-based quantum error correction using transmon dual-rail qubits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_16292 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Fast, High-Fidelity Erasure Detection of Dual-Rail Qubits with Symmetrically Coupled Readout Hung, Jimmy Shih-Chun Haim, Arbel Raha, Mouktik Kim, Gihwan Huang, Ziwen Chou, Ming-Han D'Ewart, Mitch Davis, Erik Mishra, Anurag Arriola, Patricio Arrangoiz Khalajhedayati, Amirhossein Hover, David Brandão, Fernando G. S. L. Clerk, Aashish A. Retzker, Alex Levine, Harry Painter, Oskar Quantum Physics Erasure qubits are a promising platform for implementing hardware-efficient quantum error correction. Realizing the error-correction advantages of this encoding requires frequent mid-circuit erasure checks that are fast, high-fidelity, and scalable. Here, we realize erasure detection with a hardware-efficient circuit consisting of a single readout resonator dispersively and symmetrically coupled to both transmons of a dual-rail qubit. We use this circuit to demonstrate single-shot erasure detection in 384 ns with minimal impact on the dual-rail logical manifold, achieving a residual error per check of $6.0(2) \times 10^{-4}$, with only $8(3) \times 10^{-5}$ induced dephasing per check, and an erasure error per check of $2.54(1)\times 10^{-2}$. The high degree of matched dispersive readout coupling ($χ$-matching) within the dual-rail qubit code space also allows us to realize a new modality: time-continuous erasure detection performed in parallel with single-qubit gates. Here we achieve a median $7.2 \times 10^{-5}$ error per gate with $< 1 \times 10^{-5}$ error induced by erasure detection. This demonstrates a reduction in erasure detection overhead as well as a crucial ingredient for soft information quantum error correction. Together, these results establish symmetrically coupled dispersive readout as a fast, hardware-efficient, and scalable component for erasure-based quantum error correction using transmon dual-rail qubits. |
| title | Fast, High-Fidelity Erasure Detection of Dual-Rail Qubits with Symmetrically Coupled Readout |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2604.16292 |