Entanglement with negative Wigner function of three thousand atoms heralded by one photon
Quantum-mechanically correlated (entangled) states of many particles are of interest in quantum information, quantum computing and quantum metrology. Metrologically useful entangled states of large atomic ensembles have been experimentally realized [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], but these states d...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2021
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| Online Access: | https://hdl.handle.net/1721.1/137405 |
| _version_ | 1826207156656930816 |
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| author | McConnell, Robert Zhang, Hao Hu, Jiazhong Ćuk, Senka Vuletić, Vladan |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics McConnell, Robert Zhang, Hao Hu, Jiazhong Ćuk, Senka Vuletić, Vladan |
| author_sort | McConnell, Robert |
| collection | MIT |
| description | Quantum-mechanically correlated (entangled) states of many particles are of interest in quantum information, quantum computing and quantum metrology. Metrologically useful entangled states of large atomic ensembles have been experimentally realized [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], but these states display Gaussian spin distribution functions with a non-negative Wigner function. Non-Gaussian entangled states have been produced in small ensembles of ions [11, 12], and very recently in large atomic ensembles [13, 14, 15]. Here, we generate entanglement in a large atomic ensemble via the interaction with a very weak laser pulse; remarkably, the detection of a single photon prepares several thousand atoms in an entangled state. We reconstruct a negative-valued Wigner function, an important hallmark of nonclassicality, and verify an entanglement depth (minimum number of mutually entangled atoms) of 2910 190 out of 3100 atoms. Attaining such a negative Wigner function and the mutual entanglement of virtually all atoms is unprecedented for an ensemble containing more than a few particles. While the achieved purity of the state is slightly below the threshold for entanglement-induced metrological gain, further technical improvement should allow the generation of states that surpass this threshold, and of more complex Schrödinger cat states for quantum metrology and information processing. |
| first_indexed | 2024-09-23T13:44:55Z |
| format | Article |
| id | mit-1721.1/137405 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T13:44:55Z |
| publishDate | 2021 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1374052021-11-05T03:18:12Z Entanglement with negative Wigner function of three thousand atoms heralded by one photon McConnell, Robert Zhang, Hao Hu, Jiazhong Ćuk, Senka Vuletić, Vladan Massachusetts Institute of Technology. Department of Physics MIT-Harvard Center for Ultracold Atoms Massachusetts Institute of Technology. Research Laboratory of Electronics General Physics and Astronomy Quantum-mechanically correlated (entangled) states of many particles are of interest in quantum information, quantum computing and quantum metrology. Metrologically useful entangled states of large atomic ensembles have been experimentally realized [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], but these states display Gaussian spin distribution functions with a non-negative Wigner function. Non-Gaussian entangled states have been produced in small ensembles of ions [11, 12], and very recently in large atomic ensembles [13, 14, 15]. Here, we generate entanglement in a large atomic ensemble via the interaction with a very weak laser pulse; remarkably, the detection of a single photon prepares several thousand atoms in an entangled state. We reconstruct a negative-valued Wigner function, an important hallmark of nonclassicality, and verify an entanglement depth (minimum number of mutually entangled atoms) of 2910 190 out of 3100 atoms. Attaining such a negative Wigner function and the mutual entanglement of virtually all atoms is unprecedented for an ensemble containing more than a few particles. While the achieved purity of the state is slightly below the threshold for entanglement-induced metrological gain, further technical improvement should allow the generation of states that surpass this threshold, and of more complex Schrödinger cat states for quantum metrology and information processing. 2021-11-04T19:30:02Z 2021-11-04T19:30:02Z 2016-06 2019-05-13T13:02:59Z Article http://purl.org/eprint/type/JournalArticle 1742-6588 1742-6596 https://hdl.handle.net/1721.1/137405 McConnell, Robert, Zhang, Hao, Hu, Jiazhong, Ćuk, Senka and Vuletić, Vladan. 2016. "Entanglement with negative Wigner function of three thousand atoms heralded by one photon." 723. en 10.1088/1742-6596/723/1/012054 Creative Commons Attribution 3.0 unported license https://creativecommons.org/licenses/by/3.0/ application/pdf IOP Publishing IOP Publishing |
| spellingShingle | General Physics and Astronomy McConnell, Robert Zhang, Hao Hu, Jiazhong Ćuk, Senka Vuletić, Vladan Entanglement with negative Wigner function of three thousand atoms heralded by one photon |
| title | Entanglement with negative Wigner function of three thousand atoms heralded by one photon |
| title_full | Entanglement with negative Wigner function of three thousand atoms heralded by one photon |
| title_fullStr | Entanglement with negative Wigner function of three thousand atoms heralded by one photon |
| title_full_unstemmed | Entanglement with negative Wigner function of three thousand atoms heralded by one photon |
| title_short | Entanglement with negative Wigner function of three thousand atoms heralded by one photon |
| title_sort | entanglement with negative wigner function of three thousand atoms heralded by one photon |
| topic | General Physics and Astronomy |
| url | https://hdl.handle.net/1721.1/137405 |
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