dorsal/arxiv
View SchemaOptimization of quantum universal detectors
| Authors | G. M. D'Ariano, P. Perinotti, M. F. Sacchi |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0309161 |
| URL | https://arxiv.org/abs/quant-ph/0309161 |
| Journal | in "Proceedings of the 8th Int. Conf. on Squeezed States and Uncertainty Relations", ed. by H. Moya-Cessa et al., (Rinton, Princeton, 2003) p. 86 |
Abstract
The expectation value <O> of an arbitrary operator O can be obtained via a universal measuring apparatus that is independent of O, by changing only the data-processing of the outcomes. Such a ``universal detector'' performs a joint measurement on the system and on a suitable ancilla prepared in a fixed state, and is equivalent to a positive operator valued measure (POVM) for the system that is ``informationally complete''. The data processing functions generally are not unique, and we pose the problem of their optimization, providing some examples for covariant POVM's, in particular for SU(d) covariance group.
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"abstract": "The expectation value \u003cO\u003e of an arbitrary operator O can be obtained via a\nuniversal measuring apparatus that is independent of O, by changing only the\ndata-processing of the outcomes. Such a ``universal detector\u0027\u0027 performs a joint\nmeasurement on the system and on a suitable ancilla prepared in a fixed state,\nand is equivalent to a positive operator valued measure (POVM) for the system\nthat is ``informationally complete\u0027\u0027. The data processing functions generally\nare not unique, and we pose the problem of their optimization, providing some\nexamples for covariant POVM\u0027s, in particular for SU(d) covariance group.",
"arxiv_id": "quant-ph/0309161",
"authors": [
"G. M. D\u0027Ariano",
"P. Perinotti",
"M. F. Sacchi"
],
"categories": [
"quant-ph"
],
"journal_ref": "in \"Proceedings of the 8th Int. Conf. on Squeezed States and\n Uncertainty Relations\", ed. by H. Moya-Cessa et al., (Rinton, Princeton,\n 2003) p. 86",
"title": "Optimization of quantum universal detectors",
"url": "https://arxiv.org/abs/quant-ph/0309161"
},
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