Active locking and entanglement in type II optical parametric oscillators
Type II optical parametric oscillators are amongst the highest-quality sources of quantum-correlated light. In particular, when pumped above threshold, such devices generate a pair of bright orthogonally-polarized beams with strong continuous-variable entanglement. However, these sources are of limi...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2018-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/aaa395 |
| _version_ | 1797750669989380096 |
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| author | Joaquín Ruiz-Rivas Germán J de Valcárcel Carlos Navarrete-Benlloch |
| author_facet | Joaquín Ruiz-Rivas Germán J de Valcárcel Carlos Navarrete-Benlloch |
| author_sort | Joaquín Ruiz-Rivas |
| collection | DOAJ |
| description | Type II optical parametric oscillators are amongst the highest-quality sources of quantum-correlated light. In particular, when pumped above threshold, such devices generate a pair of bright orthogonally-polarized beams with strong continuous-variable entanglement. However, these sources are of limited practical use, because the entangled beams emerge with different frequencies and a diffusing phase difference. It has been proven that the use of an internal wave-plate coupling the modes with orthogonal polarization is capable of locking the frequencies of the emerging beams to half the pump frequency, as well as reducing the phase-difference diffusion, at the expense of reducing the entanglement levels. In this work we characterize theoretically an alternative locking mechanism: the injection of a laser at half the pump frequency. Apart from being less invasive, this method should allow for an easier real-time experimental control. We show that such an injection is capable of generating the desired phase locking between the emerging beams, while still allowing for large levels of entanglement. Moreover, we find an additional region of the parameter space (at relatively large injections) where a mode with well defined polarization is in a highly amplitude-squeezed state. |
| first_indexed | 2024-03-12T16:36:11Z |
| format | Article |
| id | doaj.art-24e4257f54b549388747d3b9c4c717fb |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:36:11Z |
| publishDate | 2018-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-24e4257f54b549388747d3b9c4c717fb2023-08-08T14:51:10ZengIOP PublishingNew Journal of Physics1367-26302018-01-0120202300410.1088/1367-2630/aaa395Active locking and entanglement in type II optical parametric oscillatorsJoaquín Ruiz-Rivas0Germán J de Valcárcel1Carlos Navarrete-Benlloch2Departament d’Òptica, Universitat de València , Dr. Moliner 50, E-46100 Burjassot, SpainDepartament d’Òptica, Universitat de València , Dr. Moliner 50, E-46100 Burjassot, SpainMax-Planck-Institute für die Physik des Lichts , Staudtstr. 2, D-91058 Erlangen, Germany; Institute for Theoretical Physics, Universität Erlangen-Nürnberg , Staudtstr. 7, D-91058 Erlangen, Germany; Max-Planck-Institut für Quantenoptik , Hans-Kopfermann-str. 1, D-85748 Garching, GermanyType II optical parametric oscillators are amongst the highest-quality sources of quantum-correlated light. In particular, when pumped above threshold, such devices generate a pair of bright orthogonally-polarized beams with strong continuous-variable entanglement. However, these sources are of limited practical use, because the entangled beams emerge with different frequencies and a diffusing phase difference. It has been proven that the use of an internal wave-plate coupling the modes with orthogonal polarization is capable of locking the frequencies of the emerging beams to half the pump frequency, as well as reducing the phase-difference diffusion, at the expense of reducing the entanglement levels. In this work we characterize theoretically an alternative locking mechanism: the injection of a laser at half the pump frequency. Apart from being less invasive, this method should allow for an easier real-time experimental control. We show that such an injection is capable of generating the desired phase locking between the emerging beams, while still allowing for large levels of entanglement. Moreover, we find an additional region of the parameter space (at relatively large injections) where a mode with well defined polarization is in a highly amplitude-squeezed state.https://doi.org/10.1088/1367-2630/aaa395nonlinear opticsquantum opticsoptical parametric oscillatorsquantum fluctuations |
| spellingShingle | Joaquín Ruiz-Rivas Germán J de Valcárcel Carlos Navarrete-Benlloch Active locking and entanglement in type II optical parametric oscillators New Journal of Physics nonlinear optics quantum optics optical parametric oscillators quantum fluctuations |
| title | Active locking and entanglement in type II optical parametric oscillators |
| title_full | Active locking and entanglement in type II optical parametric oscillators |
| title_fullStr | Active locking and entanglement in type II optical parametric oscillators |
| title_full_unstemmed | Active locking and entanglement in type II optical parametric oscillators |
| title_short | Active locking and entanglement in type II optical parametric oscillators |
| title_sort | active locking and entanglement in type ii optical parametric oscillators |
| topic | nonlinear optics quantum optics optical parametric oscillators quantum fluctuations |
| url | https://doi.org/10.1088/1367-2630/aaa395 |
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