Network-Device-Independent Certification of Causal Nonseparability
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866914997248983040 |
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| author | Dourdent, Hippolyte Abbott, Alastair A. Šupić, Ivan Branciard, Cyril |
| author_facet | Dourdent, Hippolyte Abbott, Alastair A. Šupić, Ivan Branciard, Cyril |
| contents | Causal nonseparability is the property underlying quantum processes incompatible with a definite causal order. So far it has remained a central open question as to whether any process with a clear physical realisation can violate a causal inequality, so that its causal nonseparability can be certified in a device-independent way, as originally conceived. Here we present a method solely based on the observed correlations, which certifies the causal nonseparability of all the processes that can induce a causally nonseparable distributed measurement in a scenario with trusted quantum input states, as defined in [Dourdent et al., Phys. Rev. Lett. 129, 090402 (2022)]. This notably includes the celebrated quantum switch. This device-independent certification is achieved by introducing a network of untrusted operations, allowing one to self-test the quantum inputs on which the effective distributed measurement induced by the process is performed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_12760 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Network-Device-Independent Certification of Causal Nonseparability Dourdent, Hippolyte Abbott, Alastair A. Šupić, Ivan Branciard, Cyril Quantum Physics Causal nonseparability is the property underlying quantum processes incompatible with a definite causal order. So far it has remained a central open question as to whether any process with a clear physical realisation can violate a causal inequality, so that its causal nonseparability can be certified in a device-independent way, as originally conceived. Here we present a method solely based on the observed correlations, which certifies the causal nonseparability of all the processes that can induce a causally nonseparable distributed measurement in a scenario with trusted quantum input states, as defined in [Dourdent et al., Phys. Rev. Lett. 129, 090402 (2022)]. This notably includes the celebrated quantum switch. This device-independent certification is achieved by introducing a network of untrusted operations, allowing one to self-test the quantum inputs on which the effective distributed measurement induced by the process is performed. |
| title | Network-Device-Independent Certification of Causal Nonseparability |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2308.12760 |