Dynamically Generated Decoherence-Free Subspaces and Subsystems on Superconducting Qubits
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arXiv
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| Autores principales: | , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866910565667962880 |
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| author | Quiroz, Gregory Pokharel, Bibek Boen, Joseph Tewala, Lina Tripathi, Vinay Williams, Devon Wu, Lian-Ao Titum, Paraj Schultz, Kevin Lidar, Daniel |
| author_facet | Quiroz, Gregory Pokharel, Bibek Boen, Joseph Tewala, Lina Tripathi, Vinay Williams, Devon Wu, Lian-Ao Titum, Paraj Schultz, Kevin Lidar, Daniel |
| contents | Decoherence-free subspaces and subsystems (DFS) preserve quantum information by encoding it into symmetry-protected states unaffected by decoherence. An inherent DFS of a given experimental system may not exist; however, through the use of dynamical decoupling (DD), one can induce symmetries that support DFSs. Here, we provide the first experimental demonstration of DD-generated DFS logical qubits. Utilizing IBM Quantum superconducting processors, we investigate two and three-qubit DFS codes comprising up to six and seven noninteracting logical qubits, respectively. Through a combination of DD and error detection, we show that DFS logical qubits can achieve up to a 23% improvement in state preservation fidelity over physical qubits subject to DD alone. This constitutes a beyond-breakeven fidelity improvement for DFS-encoded qubits. Our results showcase the potential utility of DFS codes as a pathway toward enhanced computational accuracy via logical encoding on quantum processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_07278 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dynamically Generated Decoherence-Free Subspaces and Subsystems on Superconducting Qubits Quiroz, Gregory Pokharel, Bibek Boen, Joseph Tewala, Lina Tripathi, Vinay Williams, Devon Wu, Lian-Ao Titum, Paraj Schultz, Kevin Lidar, Daniel Quantum Physics Decoherence-free subspaces and subsystems (DFS) preserve quantum information by encoding it into symmetry-protected states unaffected by decoherence. An inherent DFS of a given experimental system may not exist; however, through the use of dynamical decoupling (DD), one can induce symmetries that support DFSs. Here, we provide the first experimental demonstration of DD-generated DFS logical qubits. Utilizing IBM Quantum superconducting processors, we investigate two and three-qubit DFS codes comprising up to six and seven noninteracting logical qubits, respectively. Through a combination of DD and error detection, we show that DFS logical qubits can achieve up to a 23% improvement in state preservation fidelity over physical qubits subject to DD alone. This constitutes a beyond-breakeven fidelity improvement for DFS-encoded qubits. Our results showcase the potential utility of DFS codes as a pathway toward enhanced computational accuracy via logical encoding on quantum processors. |
| title | Dynamically Generated Decoherence-Free Subspaces and Subsystems on Superconducting Qubits |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2402.07278 |