Device-independent certification of indefinite causal order in the quantum switch
Quantum theory is compatible with scenarios in which the order of operations is indefinite. Experimental investigations of such scenarios, all of which have been based on a process known as the quantum switch, have provided demonstrations of indefinite causal order conditioned on assumptions on the...
| Glavni autori: | , , |
|---|---|
| Format: | Journal article |
| Jezik: | English |
| Izdano: |
Springer Nature
2023
|
| Teme: |
| _version_ | 1826311052048990208 |
|---|---|
| author | van der Lugt, T Barrett, J Chiribella, G |
| author_facet | van der Lugt, T Barrett, J Chiribella, G |
| author_sort | van der Lugt, T |
| collection | OXFORD |
| description | Quantum theory is compatible with scenarios in which the order of operations is indefinite. Experimental investigations of such scenarios, all of which have been based on a process known as the quantum switch, have provided demonstrations of indefinite causal order conditioned on assumptions on the devices used in the laboratory. But is a device-independent certification possible, similar to the certification of Bell nonlocality through the violation of Bell inequalities? Previous results have shown that the answer is negative if the switch is considered in isolation. Here, however, we present an inequality that can be used to device-independently certify indefinite causal order in the quantum switch in the presence of an additional spacelike-separated observer under an assumption asserting the impossibility of superluminal and retrocausal influences. |
| first_indexed | 2024-03-07T08:02:40Z |
| format | Journal article |
| id | oxford-uuid:c86de8d0-d2ee-4e27-93da-7fc7da4b2bec |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:02:40Z |
| publishDate | 2023 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | oxford-uuid:c86de8d0-d2ee-4e27-93da-7fc7da4b2bec2023-10-06T09:28:01ZDevice-independent certification of indefinite causal order in the quantum switchJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c86de8d0-d2ee-4e27-93da-7fc7da4b2becQuantum physicsTheoretical physicsQuantum informationEnglishSymplectic ElementsSpringer Nature2023van der Lugt, TBarrett, JChiribella, GQuantum theory is compatible with scenarios in which the order of operations is indefinite. Experimental investigations of such scenarios, all of which have been based on a process known as the quantum switch, have provided demonstrations of indefinite causal order conditioned on assumptions on the devices used in the laboratory. But is a device-independent certification possible, similar to the certification of Bell nonlocality through the violation of Bell inequalities? Previous results have shown that the answer is negative if the switch is considered in isolation. Here, however, we present an inequality that can be used to device-independently certify indefinite causal order in the quantum switch in the presence of an additional spacelike-separated observer under an assumption asserting the impossibility of superluminal and retrocausal influences. |
| spellingShingle | Quantum physics Theoretical physics Quantum information van der Lugt, T Barrett, J Chiribella, G Device-independent certification of indefinite causal order in the quantum switch |
| title | Device-independent certification of indefinite causal order in the quantum switch |
| title_full | Device-independent certification of indefinite causal order in the quantum switch |
| title_fullStr | Device-independent certification of indefinite causal order in the quantum switch |
| title_full_unstemmed | Device-independent certification of indefinite causal order in the quantum switch |
| title_short | Device-independent certification of indefinite causal order in the quantum switch |
| title_sort | device independent certification of indefinite causal order in the quantum switch |
| topic | Quantum physics Theoretical physics Quantum information |
| work_keys_str_mv | AT vanderlugtt deviceindependentcertificationofindefinitecausalorderinthequantumswitch AT barrettj deviceindependentcertificationofindefinitecausalorderinthequantumswitch AT chiribellag deviceindependentcertificationofindefinitecausalorderinthequantumswitch |