Conditional Dynamics of Open Quantum Systems: Conditional Dynamics of Open Quantum Systems: the Case of Multiple Observers
Many observers can simultaneously measure different parts of an environment of a quantum system in order to find out its state. To study this problem we generalize the formalism of conditional master equations to the multiple observer case. To settle some issues of principle which arise in this cont...
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ftdatacite:10.48550/arxiv.quant-ph/0106036 2023-05-15T18:32:41+02:00 Conditional Dynamics of Open Quantum Systems: Conditional Dynamics of Open Quantum Systems: the Case of Multiple Observers Dziarmaga, J. Dalvit, D. A. R. Zurek, W. H. 2001 https://dx.doi.org/10.48550/arxiv.quant-ph/0106036 https://arxiv.org/abs/quant-ph/0106036 unknown arXiv Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004 http://arxiv.org/licenses/assumed-1991-2003/ Quantum Physics quant-ph FOS Physical sciences Preprint Article article CreativeWork 2001 ftdatacite https://doi.org/10.48550/arxiv.quant-ph/0106036 2022-04-01T16:42:12Z Many observers can simultaneously measure different parts of an environment of a quantum system in order to find out its state. To study this problem we generalize the formalism of conditional master equations to the multiple observer case. To settle some issues of principle which arise in this context (as the state of the system and of the environment are ultimately correlated), we consider an example of a system qubit interacting through controlled nots (CNOTs) with environmental qubits. The state of the system is the easiest to find out for observers who measure in a basis of the environment which is most correlated with the pointer basis of the system. In this case the observers agree the most. Furthermore, the more predictable the pointers are, the easier it is to find the state of the system, and the better is the agreement between different observers. : 4 pages, 2 .eps figures Report The Pointers DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
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topic |
Quantum Physics quant-ph FOS Physical sciences |
spellingShingle |
Quantum Physics quant-ph FOS Physical sciences Dziarmaga, J. Dalvit, D. A. R. Zurek, W. H. Conditional Dynamics of Open Quantum Systems: Conditional Dynamics of Open Quantum Systems: the Case of Multiple Observers |
topic_facet |
Quantum Physics quant-ph FOS Physical sciences |
description |
Many observers can simultaneously measure different parts of an environment of a quantum system in order to find out its state. To study this problem we generalize the formalism of conditional master equations to the multiple observer case. To settle some issues of principle which arise in this context (as the state of the system and of the environment are ultimately correlated), we consider an example of a system qubit interacting through controlled nots (CNOTs) with environmental qubits. The state of the system is the easiest to find out for observers who measure in a basis of the environment which is most correlated with the pointer basis of the system. In this case the observers agree the most. Furthermore, the more predictable the pointers are, the easier it is to find the state of the system, and the better is the agreement between different observers. : 4 pages, 2 .eps figures |
format |
Report |
author |
Dziarmaga, J. Dalvit, D. A. R. Zurek, W. H. |
author_facet |
Dziarmaga, J. Dalvit, D. A. R. Zurek, W. H. |
author_sort |
Dziarmaga, J. |
title |
Conditional Dynamics of Open Quantum Systems: Conditional Dynamics of Open Quantum Systems: the Case of Multiple Observers |
title_short |
Conditional Dynamics of Open Quantum Systems: Conditional Dynamics of Open Quantum Systems: the Case of Multiple Observers |
title_full |
Conditional Dynamics of Open Quantum Systems: Conditional Dynamics of Open Quantum Systems: the Case of Multiple Observers |
title_fullStr |
Conditional Dynamics of Open Quantum Systems: Conditional Dynamics of Open Quantum Systems: the Case of Multiple Observers |
title_full_unstemmed |
Conditional Dynamics of Open Quantum Systems: Conditional Dynamics of Open Quantum Systems: the Case of Multiple Observers |
title_sort |
conditional dynamics of open quantum systems: conditional dynamics of open quantum systems: the case of multiple observers |
publisher |
arXiv |
publishDate |
2001 |
url |
https://dx.doi.org/10.48550/arxiv.quant-ph/0106036 https://arxiv.org/abs/quant-ph/0106036 |
genre |
The Pointers |
genre_facet |
The Pointers |
op_rights |
Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004 http://arxiv.org/licenses/assumed-1991-2003/ |
op_doi |
https://doi.org/10.48550/arxiv.quant-ph/0106036 |
_version_ |
1766216869780389888 |