dorsal/arxiv
View SchemaMeasuring quantum entanglement without prior state reconstruction
| Authors | Pawel Horodecki |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0111082 |
| URL | https://arxiv.org/abs/quant-ph/0111082 |
Abstract
It is shown that, despite strong nonlinearity, entanglement of formation of two-qubit state can be measured without prior state reconstruction. Collective measurements on small number of copies are provided that allow to determine quantum concurrence {\it via} estimation of only {\it four} parameters. It is also pointed out that another entanglement measure based on so called negativity can also be measured in similar way. The result is related to general problem: what kind of information can be extracted efficiently from unknown quantum state ?
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"date_created": "2026-03-02T18:01:48.280000Z",
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"abstract": "It is shown that, despite strong nonlinearity, entanglement of formation of\ntwo-qubit state can be measured without prior state reconstruction. Collective\nmeasurements on small number of copies are provided that allow to determine\nquantum concurrence {\\it via} estimation of only {\\it four} parameters. It is\nalso pointed out that another entanglement measure based on so called\nnegativity can also be measured in similar way. The result is related to\ngeneral problem: what kind of information can be extracted efficiently from\nunknown quantum state ?",
"arxiv_id": "quant-ph/0111082",
"authors": [
"Pawel Horodecki"
],
"categories": [
"quant-ph"
],
"title": "Measuring quantum entanglement without prior state reconstruction",
"url": "https://arxiv.org/abs/quant-ph/0111082"
},
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