Long-time storage of entangled logical states in decoherence-free subspaces
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866917321537224704 |
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| author | Zhang, L. Xu, Y. -L. Wu, Y. -K. Zhang, C. Cui, Z. -B. Chen, Y. -Y. Lian, W. -Q. Ma, J. -Y. Qi, B. -X. Pu, Y. -F. Zhou, Z. -C. He, L. Hou, P. -Y. Duan, L. -M. |
| author_facet | Zhang, L. Xu, Y. -L. Wu, Y. -K. Zhang, C. Cui, Z. -B. Chen, Y. -Y. Lian, W. -Q. Ma, J. -Y. Qi, B. -X. Pu, Y. -F. Zhou, Z. -C. He, L. Hou, P. -Y. Duan, L. -M. |
| contents | The maintenance of quantum entanglement lays the elementary building block of quantum information processing, requiring an integration of long coherence time, sufficient storage capacity, and high-fidelity entangling gates. Here we encode two-qubit entangled states into the decoherence-free subspaces (DFS) of four ions in a cryogenic trap. By crosstalk-free sympathetic cooling under dual-type encoding and multi-state detection which discards the collision-induced leakage error, we achieve a storage lifetime of about one hour for the entangled logical states. We further study the second-order DFS and show its advantage in suppressing the spatially nonuniform noise over the first-order DFS. Our work paves the way for applications of DFS quantum memories in quantum computing, quantum network and precision measurement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_07190 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Long-time storage of entangled logical states in decoherence-free subspaces Zhang, L. Xu, Y. -L. Wu, Y. -K. Zhang, C. Cui, Z. -B. Chen, Y. -Y. Lian, W. -Q. Ma, J. -Y. Qi, B. -X. Pu, Y. -F. Zhou, Z. -C. He, L. Hou, P. -Y. Duan, L. -M. Quantum Physics The maintenance of quantum entanglement lays the elementary building block of quantum information processing, requiring an integration of long coherence time, sufficient storage capacity, and high-fidelity entangling gates. Here we encode two-qubit entangled states into the decoherence-free subspaces (DFS) of four ions in a cryogenic trap. By crosstalk-free sympathetic cooling under dual-type encoding and multi-state detection which discards the collision-induced leakage error, we achieve a storage lifetime of about one hour for the entangled logical states. We further study the second-order DFS and show its advantage in suppressing the spatially nonuniform noise over the first-order DFS. Our work paves the way for applications of DFS quantum memories in quantum computing, quantum network and precision measurement. |
| title | Long-time storage of entangled logical states in decoherence-free subspaces |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.07190 |