Temporal Entanglement and Witnesses of Non-Classicality
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918062881505280 |
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| author | Di Pietra, Giuseppe Bhole, Gaurav Eaton, James Baldwin, Andrew J. Jones, Jonathan A. Vedral, Vlatko Marletto, Chiara |
| author_facet | Di Pietra, Giuseppe Bhole, Gaurav Eaton, James Baldwin, Andrew J. Jones, Jonathan A. Vedral, Vlatko Marletto, Chiara |
| contents | The universality of quantum theory has been questioned ever since it was proposed. Key to this long-unsolved question is to test whether a given physical system has non-classical features. Here we connect recently proposed witnesses of non-classicality, based on information-theoretic ideas, with the theory of temporal entanglement. We provide a protocol to witness the non-classicality of a system by probing it with a qubit: we show that, assuming a general conservation law, violating temporal Bell inequalities on the qubit probe implies the non-classicality of the system under investigation. We also perform proof-of-principle experimental emulations of the proposed witness of non-classicality, using a three qubit Nuclear Magnetic Resonance quantum computer. Our result is robust, as it relies on minimal assumptions, and remarkably it can be applied in a broad range of contexts, from quantum biology to quantum gravity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_15474 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Temporal Entanglement and Witnesses of Non-Classicality Di Pietra, Giuseppe Bhole, Gaurav Eaton, James Baldwin, Andrew J. Jones, Jonathan A. Vedral, Vlatko Marletto, Chiara Quantum Physics The universality of quantum theory has been questioned ever since it was proposed. Key to this long-unsolved question is to test whether a given physical system has non-classical features. Here we connect recently proposed witnesses of non-classicality, based on information-theoretic ideas, with the theory of temporal entanglement. We provide a protocol to witness the non-classicality of a system by probing it with a qubit: we show that, assuming a general conservation law, violating temporal Bell inequalities on the qubit probe implies the non-classicality of the system under investigation. We also perform proof-of-principle experimental emulations of the proposed witness of non-classicality, using a three qubit Nuclear Magnetic Resonance quantum computer. Our result is robust, as it relies on minimal assumptions, and remarkably it can be applied in a broad range of contexts, from quantum biology to quantum gravity. |
| title | Temporal Entanglement and Witnesses of Non-Classicality |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.15474 |