Enhancing quantum entanglement by photon addition and subtraction
The non-Gaussian operations effected by adding or subtracting a photon on entangled optical beams emerging from a parametric down-conversion process have been suggested to enhance entanglement. Heralded photon addition or subtraction is, as a matter of fact, at the heart of continuous-variable entan...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2012
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| Online Access: | http://hdl.handle.net/1721.1/75023 https://orcid.org/0000-0002-6094-5861 |
| _version_ | 1811075271601684480 |
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| author | Navarrete-Benlloch, Carlos Garcia-Patron Sanchez, Raul Shapiro, Jeffrey H. Cerf, Nicolas J. |
| author2 | Massachusetts Institute of Technology. Research Laboratory of Electronics |
| author_facet | Massachusetts Institute of Technology. Research Laboratory of Electronics Navarrete-Benlloch, Carlos Garcia-Patron Sanchez, Raul Shapiro, Jeffrey H. Cerf, Nicolas J. |
| author_sort | Navarrete-Benlloch, Carlos |
| collection | MIT |
| description | The non-Gaussian operations effected by adding or subtracting a photon on entangled optical beams emerging from a parametric down-conversion process have been suggested to enhance entanglement. Heralded photon addition or subtraction is, as a matter of fact, at the heart of continuous-variable entanglement distillation. The use of such processes has recently been experimentally demonstrated in the context of the generation of optical coherent-state superpositions or the verification of canonical commutation relations. Here, we carry out a systematic study of the effect of local photon additions and subtractions on a two-mode squeezed vacuum state, showing that the entanglement generally increases with the number of such operations. This is analytically proven when additions or subtractions are restricted to one mode only, while we observe that the highest entanglement is achieved when these operations are equally shared between the two modes. We also note that adding photons typically provides a stronger entanglement enhancement than subtracting photons, while photon subtraction performs better in terms of energy efficiency. Furthermore, we analyze the interplay between entanglement and non-Gaussianity, showing that it is more subtle than previously expected. |
| first_indexed | 2024-09-23T10:03:27Z |
| format | Article |
| id | mit-1721.1/75023 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:03:27Z |
| publishDate | 2012 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/750232022-09-30T18:36:21Z Enhancing quantum entanglement by photon addition and subtraction Navarrete-Benlloch, Carlos Garcia-Patron Sanchez, Raul Shapiro, Jeffrey H. Cerf, Nicolas J. Massachusetts Institute of Technology. Research Laboratory of Electronics Navarrete-Benlloch, Carlos Garcia-Patron Sanchez, Raul Shapiro, Jeffrey H. Cerf, Nicolas J. The non-Gaussian operations effected by adding or subtracting a photon on entangled optical beams emerging from a parametric down-conversion process have been suggested to enhance entanglement. Heralded photon addition or subtraction is, as a matter of fact, at the heart of continuous-variable entanglement distillation. The use of such processes has recently been experimentally demonstrated in the context of the generation of optical coherent-state superpositions or the verification of canonical commutation relations. Here, we carry out a systematic study of the effect of local photon additions and subtractions on a two-mode squeezed vacuum state, showing that the entanglement generally increases with the number of such operations. This is analytically proven when additions or subtractions are restricted to one mode only, while we observe that the highest entanglement is achieved when these operations are equally shared between the two modes. We also note that adding photons typically provides a stronger entanglement enhancement than subtracting photons, while photon subtraction performs better in terms of energy efficiency. Furthermore, we analyze the interplay between entanglement and non-Gaussianity, showing that it is more subtle than previously expected. Spain. Ministerio de Ciencia e Innovación (MICINN). FPU Program W. M. Keck Foundation Center for Extreme Quantum Information Theory Alexander von Humboldt-Stiftung United States. Office of Naval Research. Basic Research Challenge Program European Union. European Regional Development Fund (Project FIS2008-06024-C03-01) European Commission. Project MALICIA (Grant 265522) 2012-11-26T19:23:42Z 2012-11-26T19:23:42Z 2012-07 2012-01 Article http://purl.org/eprint/type/JournalArticle 1050-2947 1094-1622 http://hdl.handle.net/1721.1/75023 Navarrete-Benlloch, Carlos et al. “Enhancing Quantum Entanglement by Photon Addition and Subtraction.” Physical Review A 86.1 (2012). ©2012 American Physical Society https://orcid.org/0000-0002-6094-5861 en_US http://dx.doi.org/10.1103/PhysRevA.86.012328 Physical Review A Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Navarrete-Benlloch, Carlos Garcia-Patron Sanchez, Raul Shapiro, Jeffrey H. Cerf, Nicolas J. Enhancing quantum entanglement by photon addition and subtraction |
| title | Enhancing quantum entanglement by photon addition and subtraction |
| title_full | Enhancing quantum entanglement by photon addition and subtraction |
| title_fullStr | Enhancing quantum entanglement by photon addition and subtraction |
| title_full_unstemmed | Enhancing quantum entanglement by photon addition and subtraction |
| title_short | Enhancing quantum entanglement by photon addition and subtraction |
| title_sort | enhancing quantum entanglement by photon addition and subtraction |
| url | http://hdl.handle.net/1721.1/75023 https://orcid.org/0000-0002-6094-5861 |
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