A resource-efficient and noise-robust entanglement witness based on the swap test
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908730432421888 |
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| author | Guaraldo, Sebastiano Mazzucchi, Sonia Baldazzi, Alessio Azzini, Stefano Pavesi, Lorenzo |
| author_facet | Guaraldo, Sebastiano Mazzucchi, Sonia Baldazzi, Alessio Azzini, Stefano Pavesi, Lorenzo |
| contents | Quantum entanglement is an essential resource for quantum technologies, and the controlled swap test provides a versatile tool for its detection and quantification. Here, we propose a SWAP-based entanglement witness that applies to arbitrary two-qubit states - both pure and mixed - and provides a lower bound on the concurrence. The method is resource-efficient, robust to noise, and platform-independent. As an example, we validate the approach on a room-temperature photonic chip, where the swap test is carried out using only linear and well-established integrated optical components. The robustness of the method against photonic-hardware noise is also analysed. Our results establish a simple and reliable tool for entanglement witnessing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_20235 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A resource-efficient and noise-robust entanglement witness based on the swap test Guaraldo, Sebastiano Mazzucchi, Sonia Baldazzi, Alessio Azzini, Stefano Pavesi, Lorenzo Quantum Physics Quantum entanglement is an essential resource for quantum technologies, and the controlled swap test provides a versatile tool for its detection and quantification. Here, we propose a SWAP-based entanglement witness that applies to arbitrary two-qubit states - both pure and mixed - and provides a lower bound on the concurrence. The method is resource-efficient, robust to noise, and platform-independent. As an example, we validate the approach on a room-temperature photonic chip, where the swap test is carried out using only linear and well-established integrated optical components. The robustness of the method against photonic-hardware noise is also analysed. Our results establish a simple and reliable tool for entanglement witnessing. |
| title | A resource-efficient and noise-robust entanglement witness based on the swap test |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2512.20235 |