Three-qubit W state tomography via full and marginal state reconstructions on ibm_osaka
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911415366844416 |
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| author | Talath, H. Govindaraja, B. P. Divyamani, B. G. H., Akshata Shenoy Devi, A. R. Usha Sudha |
| author_facet | Talath, H. Govindaraja, B. P. Divyamani, B. G. H., Akshata Shenoy Devi, A. R. Usha Sudha |
| contents | We present a three-qubit quantum state tomography scheme requiring a set of 17 measurement settings, significantly reducing the experimental overhead compared to the conventional 63 Pauli measurement settings. Using IBM's 127-qubit open-access quantum processor ibm osaka, we prepare the three-qubit W state and employ our tomography scheme to reconstruct it. Additionally, we implement a two-qubit tomography protocol, involving 7 measurement settings, on ibm osaka to reconstruct two of the two-qubit marginals of the W state. This serves as a {\em proof-of-principle} demonstration of the well-known theoretical result that any two of the two-qubit reduced density matrices can uniquely determine most of the whole three-qubit pure states. We show that the fidelity of the W-state reconstructed from its two-qubit subsystems is consistently larger than that obtained from the full three-qubit tomography, highlighting the practical advantage of the subsystem-based tomography approach. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_02849 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Three-qubit W state tomography via full and marginal state reconstructions on ibm_osaka Talath, H. Govindaraja, B. P. Divyamani, B. G. H., Akshata Shenoy Devi, A. R. Usha Sudha Quantum Physics We present a three-qubit quantum state tomography scheme requiring a set of 17 measurement settings, significantly reducing the experimental overhead compared to the conventional 63 Pauli measurement settings. Using IBM's 127-qubit open-access quantum processor ibm osaka, we prepare the three-qubit W state and employ our tomography scheme to reconstruct it. Additionally, we implement a two-qubit tomography protocol, involving 7 measurement settings, on ibm osaka to reconstruct two of the two-qubit marginals of the W state. This serves as a {\em proof-of-principle} demonstration of the well-known theoretical result that any two of the two-qubit reduced density matrices can uniquely determine most of the whole three-qubit pure states. We show that the fidelity of the W-state reconstructed from its two-qubit subsystems is consistently larger than that obtained from the full three-qubit tomography, highlighting the practical advantage of the subsystem-based tomography approach. |
| title | Three-qubit W state tomography via full and marginal state reconstructions on ibm_osaka |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2507.02849 |