Transverse entanglement of biphotons
We measure the transverse entanglement of photon pairs on their propagation from the near to the far field of spontaneous parametric down-conversion (SPDC). The Fedorov ratio, depending on the widths of conditional and unconditional intensity measurements, is shown to be only able to characterize en...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2013-01-01
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| Series: | New Journal of Physics |
| Online Access: | https://doi.org/10.1088/1367-2630/15/8/083015 |
| _version_ | 1827874148427235328 |
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| author | F Just A Cavanna M V Chekhova G Leuchs |
| author_facet | F Just A Cavanna M V Chekhova G Leuchs |
| author_sort | F Just |
| collection | DOAJ |
| description | We measure the transverse entanglement of photon pairs on their propagation from the near to the far field of spontaneous parametric down-conversion (SPDC). The Fedorov ratio, depending on the widths of conditional and unconditional intensity measurements, is shown to be only able to characterize entanglement in the near and far field zones of the source. Therefore we also follow a different approach. By evaluating the first-order coherence of a subsystem of the state we can quantify its entanglement. Unlike previous measurements, which determine the Fedorov ratio via intensity correlations, our setup is sensitive to both phase and modulus of the biphoton state and thus always grants experimental access to the full transverse entanglement of the SPDC state. It is shown theoretically that this scheme represents a direct measurement of the Schmidt number. |
| first_indexed | 2024-03-12T16:48:05Z |
| format | Article |
| id | doaj.art-ea5189d7f18f44328453b817e4f3d8f6 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:48:05Z |
| publishDate | 2013-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-ea5189d7f18f44328453b817e4f3d8f62023-08-08T11:29:31ZengIOP PublishingNew Journal of Physics1367-26302013-01-0115808301510.1088/1367-2630/15/8/083015Transverse entanglement of biphotonsF Just0A Cavanna1M V Chekhova2G Leuchs3Max Planck Institute for the Science of Light , Günther-Scharowsky-Straße 1/Bau 24, D-91058 Erlangen, GermanyMax Planck Institute for the Science of Light , Günther-Scharowsky-Straße 1/Bau 24, D-91058 Erlangen, GermanyMax Planck Institute for the Science of Light , Günther-Scharowsky-Straße 1/Bau 24, D-91058 Erlangen, Germany; Department of Physics, M V Lomonosov Moscow State University , Leninskie Gory, 119991 Moscow, Russia; University of Erlangen-Nürnberg , Staudtstrasse 7/B2, D-91058 Erlangen, GermanyMax Planck Institute for the Science of Light , Günther-Scharowsky-Straße 1/Bau 24, D-91058 Erlangen, Germany; University of Erlangen-Nürnberg , Staudtstrasse 7/B2, D-91058 Erlangen, GermanyWe measure the transverse entanglement of photon pairs on their propagation from the near to the far field of spontaneous parametric down-conversion (SPDC). The Fedorov ratio, depending on the widths of conditional and unconditional intensity measurements, is shown to be only able to characterize entanglement in the near and far field zones of the source. Therefore we also follow a different approach. By evaluating the first-order coherence of a subsystem of the state we can quantify its entanglement. Unlike previous measurements, which determine the Fedorov ratio via intensity correlations, our setup is sensitive to both phase and modulus of the biphoton state and thus always grants experimental access to the full transverse entanglement of the SPDC state. It is shown theoretically that this scheme represents a direct measurement of the Schmidt number.https://doi.org/10.1088/1367-2630/15/8/083015 |
| spellingShingle | F Just A Cavanna M V Chekhova G Leuchs Transverse entanglement of biphotons New Journal of Physics |
| title | Transverse entanglement of biphotons |
| title_full | Transverse entanglement of biphotons |
| title_fullStr | Transverse entanglement of biphotons |
| title_full_unstemmed | Transverse entanglement of biphotons |
| title_short | Transverse entanglement of biphotons |
| title_sort | transverse entanglement of biphotons |
| url | https://doi.org/10.1088/1367-2630/15/8/083015 |
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