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- Publisher Website: 10.1103/PhysRevLett.117.150502
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Article: Quantum Change Point
Title | Quantum Change Point |
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Authors | |
Issue Date | 2016 |
Publisher | American Physical Society. The Journal's web site is located at http://prl.aps.org |
Citation | Physical Review Letters, 2016, v. 117 n. 15, article no. 150502 , p. 1-5 How to Cite? |
Abstract | Sudden changes are ubiquitous in nature. Identifying them is crucial for a number of applications in biology, medicine, and social sciences. Here we take the problem of detecting sudden changes to the quantum domain. We consider a source that emits quantum particles in a default state, until a point where a mutation occurs that causes the source to switch to another state. The problem is then to find out where the change occurred. We determine the maximum probability of correctly identifying the change point, allowing for collective measurements on the whole sequence of particles emitted by the source. Then, we devise online strategies where the particles are measured individually and an answer is provided as soon as a new particle is received. We show that these online strategies substantially underperform the optimal quantum measurement, indicating that quantum sudden changes, although happening locally, are better detected globally. |
Persistent Identifier | http://hdl.handle.net/10722/242403 |
ISSN | 2023 Impact Factor: 8.1 2023 SCImago Journal Rankings: 3.040 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Sentis, G | - |
dc.contributor.author | Bagan, E | - |
dc.contributor.author | Calsamiglia, J | - |
dc.contributor.author | Chiribella, G | - |
dc.contributor.author | Muñoz-Tapia, R | - |
dc.date.accessioned | 2017-07-24T01:39:22Z | - |
dc.date.available | 2017-07-24T01:39:22Z | - |
dc.date.issued | 2016 | - |
dc.identifier.citation | Physical Review Letters, 2016, v. 117 n. 15, article no. 150502 , p. 1-5 | - |
dc.identifier.issn | 0031-9007 | - |
dc.identifier.uri | http://hdl.handle.net/10722/242403 | - |
dc.description.abstract | Sudden changes are ubiquitous in nature. Identifying them is crucial for a number of applications in biology, medicine, and social sciences. Here we take the problem of detecting sudden changes to the quantum domain. We consider a source that emits quantum particles in a default state, until a point where a mutation occurs that causes the source to switch to another state. The problem is then to find out where the change occurred. We determine the maximum probability of correctly identifying the change point, allowing for collective measurements on the whole sequence of particles emitted by the source. Then, we devise online strategies where the particles are measured individually and an answer is provided as soon as a new particle is received. We show that these online strategies substantially underperform the optimal quantum measurement, indicating that quantum sudden changes, although happening locally, are better detected globally. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at http://prl.aps.org | - |
dc.relation.ispartof | Physical Review Letters | - |
dc.rights | Copyright 2016 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevLett.117.150502 | - |
dc.title | Quantum Change Point | - |
dc.type | Article | - |
dc.identifier.email | Chiribella, G: giulio@hku.hk | - |
dc.identifier.authority | Chiribella, G=rp02035 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevLett.117.150502 | - |
dc.identifier.scopus | eid_2-s2.0-84992152130 | - |
dc.identifier.hkuros | 273317 | - |
dc.identifier.volume | 117 | - |
dc.identifier.issue | 15 | - |
dc.identifier.spage | article no. 150502, p. 1 | - |
dc.identifier.epage | article no. 150502, p. 5 | - |
dc.identifier.isi | WOS:000385341900002 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0031-9007 | - |