Shared randomness allows violation of macroscopic realism using a single measurement
Macro-realistic description of systems is based majorly on two basic intuitions about the classical world, namely, macrorealism per se, that is, the system is always in a distinct state, and non-invasive measurements, that is, measurements do not disturb the system. Given the assumption of no-signal...
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AIP Publishing LLC
2025-06-01
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| Series: | APL Quantum |
| Online Access: | http://dx.doi.org/10.1063/5.0252123 |
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| author | Shubhayan Sarkar |
| author_facet | Shubhayan Sarkar |
| author_sort | Shubhayan Sarkar |
| collection | DOAJ |
| description | Macro-realistic description of systems is based majorly on two basic intuitions about the classical world, namely, macrorealism per se, that is, the system is always in a distinct state, and non-invasive measurements, that is, measurements do not disturb the system. Given the assumption of no-signaling in time, one utilizes Leggett–Garg inequalities to observe a violation of macroscopic realism, which requires at least three measurements. In this work, we show that if one has access to shared randomness, then one can observe a violation of macroscopic realism using a single measurement even if no signaling in time is satisfied. Interestingly, using the proposed scheme one can also rule out a larger class of models, which we term macroscopic no-signaling theories that cannot violate the no-signaling in time conditions. We further construct a witness to observe the violation of macroscopic no-signaling. |
| format | Article |
| id | doaj-art-cb112f5910f847aa9d23aa7acd4c8c2b |
| institution | Kabale University |
| issn | 2835-0103 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Quantum |
| spelling | doaj-art-cb112f5910f847aa9d23aa7acd4c8c2b2025-08-20T03:28:47ZengAIP Publishing LLCAPL Quantum2835-01032025-06-0122026128026128-510.1063/5.0252123Shared randomness allows violation of macroscopic realism using a single measurementShubhayan Sarkar0Laboratoire d’Information Quantique, Université libre de Bruxelles (ULB), Av. F. D. Roosevelt 50, 1050 Bruxelles, BelgiumMacro-realistic description of systems is based majorly on two basic intuitions about the classical world, namely, macrorealism per se, that is, the system is always in a distinct state, and non-invasive measurements, that is, measurements do not disturb the system. Given the assumption of no-signaling in time, one utilizes Leggett–Garg inequalities to observe a violation of macroscopic realism, which requires at least three measurements. In this work, we show that if one has access to shared randomness, then one can observe a violation of macroscopic realism using a single measurement even if no signaling in time is satisfied. Interestingly, using the proposed scheme one can also rule out a larger class of models, which we term macroscopic no-signaling theories that cannot violate the no-signaling in time conditions. We further construct a witness to observe the violation of macroscopic no-signaling.http://dx.doi.org/10.1063/5.0252123 |
| spellingShingle | Shubhayan Sarkar Shared randomness allows violation of macroscopic realism using a single measurement APL Quantum |
| title | Shared randomness allows violation of macroscopic realism using a single measurement |
| title_full | Shared randomness allows violation of macroscopic realism using a single measurement |
| title_fullStr | Shared randomness allows violation of macroscopic realism using a single measurement |
| title_full_unstemmed | Shared randomness allows violation of macroscopic realism using a single measurement |
| title_short | Shared randomness allows violation of macroscopic realism using a single measurement |
| title_sort | shared randomness allows violation of macroscopic realism using a single measurement |
| url | http://dx.doi.org/10.1063/5.0252123 |
| work_keys_str_mv | AT shubhayansarkar sharedrandomnessallowsviolationofmacroscopicrealismusingasinglemeasurement |