Entangling entanglement: coupling frequency and polarization of biphotons on demand
Abstract Quantum information is often carried in the frequency and polarization degrees of freedom (DoFs) in single photons and entangled photons. We demonstrate an approach to couple and decouple the frequency and polarization DoFs of broadband biphotons. Our approach is based on a nonlinear interf...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2024-04-01
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| Series: | npj Quantum Information |
| Online Access: | https://doi.org/10.1038/s41534-024-00837-6 |
| _version_ | 1797209199321546752 |
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| author | Arash Riazi Eric Y. Zhu Dan Xu Li Qian |
| author_facet | Arash Riazi Eric Y. Zhu Dan Xu Li Qian |
| author_sort | Arash Riazi |
| collection | DOAJ |
| description | Abstract Quantum information is often carried in the frequency and polarization degrees of freedom (DoFs) in single photons and entangled photons. We demonstrate an approach to couple and decouple the frequency and polarization DoFs of broadband biphotons. Our approach is based on a nonlinear interferometer consisting of a linear dispersive medium and a polarization controller in between the two biphoton sources (nonlinear media). When the two DoFs are decoupled, maximally polarization-entangled biphotons are observed in the polarization DoF, while interference fringes are observed in the spectrum of the biphotons. When the two DoFs are coupled, by adjusting the polarization controller, interference fringes disappear from the spectrum and instead appear in the degree of polarization entanglement, varying between 0 and 1, depending on the signal and idler frequencies. Our approach offers a convenient means of tuning the polarization entanglement and can be employed for arbitrary biphoton polarization state generation. |
| first_indexed | 2024-04-24T09:50:54Z |
| format | Article |
| id | doaj.art-38c4d4cb1f524545a7952b9838e2e894 |
| institution | Directory Open Access Journal |
| issn | 2056-6387 |
| language | English |
| last_indexed | 2024-04-24T09:50:54Z |
| publishDate | 2024-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Information |
| spelling | doaj.art-38c4d4cb1f524545a7952b9838e2e8942024-04-14T11:23:57ZengNature Portfolionpj Quantum Information2056-63872024-04-011011810.1038/s41534-024-00837-6Entangling entanglement: coupling frequency and polarization of biphotons on demandArash Riazi0Eric Y. Zhu1Dan Xu2Li Qian3Department of Electrical and Computer Engineering, University of TorontoDepartment of Electrical and Computer Engineering, University of TorontoDepartment of Electrical and Computer Engineering, University of TorontoDepartment of Electrical and Computer Engineering, University of TorontoAbstract Quantum information is often carried in the frequency and polarization degrees of freedom (DoFs) in single photons and entangled photons. We demonstrate an approach to couple and decouple the frequency and polarization DoFs of broadband biphotons. Our approach is based on a nonlinear interferometer consisting of a linear dispersive medium and a polarization controller in between the two biphoton sources (nonlinear media). When the two DoFs are decoupled, maximally polarization-entangled biphotons are observed in the polarization DoF, while interference fringes are observed in the spectrum of the biphotons. When the two DoFs are coupled, by adjusting the polarization controller, interference fringes disappear from the spectrum and instead appear in the degree of polarization entanglement, varying between 0 and 1, depending on the signal and idler frequencies. Our approach offers a convenient means of tuning the polarization entanglement and can be employed for arbitrary biphoton polarization state generation.https://doi.org/10.1038/s41534-024-00837-6 |
| spellingShingle | Arash Riazi Eric Y. Zhu Dan Xu Li Qian Entangling entanglement: coupling frequency and polarization of biphotons on demand npj Quantum Information |
| title | Entangling entanglement: coupling frequency and polarization of biphotons on demand |
| title_full | Entangling entanglement: coupling frequency and polarization of biphotons on demand |
| title_fullStr | Entangling entanglement: coupling frequency and polarization of biphotons on demand |
| title_full_unstemmed | Entangling entanglement: coupling frequency and polarization of biphotons on demand |
| title_short | Entangling entanglement: coupling frequency and polarization of biphotons on demand |
| title_sort | entangling entanglement coupling frequency and polarization of biphotons on demand |
| url | https://doi.org/10.1038/s41534-024-00837-6 |
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