Events in quantum mechanics are maximally non-absolute
The notorious quantum measurement problem brings out the difficulty to reconcile two quantum postulates: the unitary evolution of closed quantum systems and the wave-function collapse after a measurement. This problematics is particularly highlighted in the Wigner's friend thought experiment, w...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften
2022-08-01
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| Series: | Quantum |
| Online Access: | https://quantum-journal.org/papers/q-2022-08-24-785/pdf/ |
| _version_ | 1811286995572359168 |
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| author | George Moreno Ranieri Nery Cristhiano Duarte Rafael Chaves |
| author_facet | George Moreno Ranieri Nery Cristhiano Duarte Rafael Chaves |
| author_sort | George Moreno |
| collection | DOAJ |
| description | The notorious quantum measurement problem brings out the difficulty to reconcile two quantum postulates: the unitary evolution of closed quantum systems and the wave-function collapse after a measurement. This problematics is particularly highlighted in the Wigner's friend thought experiment, where the mismatch between unitary evolution and measurement collapse leads to conflicting quantum descriptions for different observers. A recent no-go theorem has established that the (quantum) statistics arising from an extended Wigner's friend scenario is incompatible when one try to hold together three innocuous assumptions, namely no-superdeterminism, parameter independence and absoluteness of observed events. Building on this extended scenario, we introduce two novel measures of non-absoluteness of events. The first is based on the EPR2 decomposition, and the second involves the relaxation of the absoluteness hypothesis assumed in the aforementioned no-go theorem. To prove that quantum correlations can be maximally non-absolute according to both quantifiers, we show that chained Bell inequalities (and relaxations thereof) are also valid constraints for Wigner's experiment. |
| first_indexed | 2024-04-13T03:10:40Z |
| format | Article |
| id | doaj.art-5d01377dbc034eb38471f34bd60b98a4 |
| institution | Directory Open Access Journal |
| issn | 2521-327X |
| language | English |
| last_indexed | 2024-04-13T03:10:40Z |
| publishDate | 2022-08-01 |
| publisher | Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften |
| record_format | Article |
| series | Quantum |
| spelling | doaj.art-5d01377dbc034eb38471f34bd60b98a42022-12-22T03:05:05ZengVerein zur Förderung des Open Access Publizierens in den QuantenwissenschaftenQuantum2521-327X2022-08-01678510.22331/q-2022-08-24-78510.22331/q-2022-08-24-785Events in quantum mechanics are maximally non-absoluteGeorge MorenoRanieri NeryCristhiano DuarteRafael ChavesThe notorious quantum measurement problem brings out the difficulty to reconcile two quantum postulates: the unitary evolution of closed quantum systems and the wave-function collapse after a measurement. This problematics is particularly highlighted in the Wigner's friend thought experiment, where the mismatch between unitary evolution and measurement collapse leads to conflicting quantum descriptions for different observers. A recent no-go theorem has established that the (quantum) statistics arising from an extended Wigner's friend scenario is incompatible when one try to hold together three innocuous assumptions, namely no-superdeterminism, parameter independence and absoluteness of observed events. Building on this extended scenario, we introduce two novel measures of non-absoluteness of events. The first is based on the EPR2 decomposition, and the second involves the relaxation of the absoluteness hypothesis assumed in the aforementioned no-go theorem. To prove that quantum correlations can be maximally non-absolute according to both quantifiers, we show that chained Bell inequalities (and relaxations thereof) are also valid constraints for Wigner's experiment.https://quantum-journal.org/papers/q-2022-08-24-785/pdf/ |
| spellingShingle | George Moreno Ranieri Nery Cristhiano Duarte Rafael Chaves Events in quantum mechanics are maximally non-absolute Quantum |
| title | Events in quantum mechanics are maximally non-absolute |
| title_full | Events in quantum mechanics are maximally non-absolute |
| title_fullStr | Events in quantum mechanics are maximally non-absolute |
| title_full_unstemmed | Events in quantum mechanics are maximally non-absolute |
| title_short | Events in quantum mechanics are maximally non-absolute |
| title_sort | events in quantum mechanics are maximally non absolute |
| url | https://quantum-journal.org/papers/q-2022-08-24-785/pdf/ |
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