Heralded amplification of nonlocality via entanglement swapping
To observe the loophole-free violation of the Clauser–Horne–Shimony–Holt (CHSH) inequality between distant two parties, i.e. the CHSH value $S\gt 2$ , the main limitation of distance stems from the loss in the transmission channel. The entanglement swapping relay (ESR) is a simple way to amplify the...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2020-01-01
|
| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ab61da |
| _version_ | 1797750278191054848 |
|---|---|
| author | Yoshiaki Tsujimoto Chenglong You Kentaro Wakui Mikio Fujiwara Kazuhiro Hayasaka Shigehito Miki Hirotaka Terai Masahide Sasaki Jonathan P Dowling Masahiro Takeoka |
| author_facet | Yoshiaki Tsujimoto Chenglong You Kentaro Wakui Mikio Fujiwara Kazuhiro Hayasaka Shigehito Miki Hirotaka Terai Masahide Sasaki Jonathan P Dowling Masahiro Takeoka |
| author_sort | Yoshiaki Tsujimoto |
| collection | DOAJ |
| description | To observe the loophole-free violation of the Clauser–Horne–Shimony–Holt (CHSH) inequality between distant two parties, i.e. the CHSH value $S\gt 2$ , the main limitation of distance stems from the loss in the transmission channel. The entanglement swapping relay (ESR) is a simple way to amplify the signal and enables us to evade the impact of the transmission loss. Here, we experimentally test the heralded nonlocality amplifier protocol based on the ESR. We observe that the obtained probability distribution is in excellent agreement with those expected by the numerical simulation with experimental parameters which are precisely characterized in a separate measurement. Moreover, we experimentally estimate the nonlocality of the heralded state after the transmission of 10 dB loss just before final detection. The estimated CHSH value is $S=2.113\gt 2$ , which indicates that our final state possesses nonlocality even with transmission loss and various experimental imperfections. Our result clarifies an important benchmark of the ESR protocol, and paves the way towards the long-distance realization of the loophole-free CHSH-violation as well as device-independent quantum key distribution. |
| first_indexed | 2024-03-12T16:31:21Z |
| format | Article |
| id | doaj.art-490983cd2cb2493fa9aceffc932b914b |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:31:21Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-490983cd2cb2493fa9aceffc932b914b2023-08-08T15:29:26ZengIOP PublishingNew Journal of Physics1367-26302020-01-0122202300810.1088/1367-2630/ab61daHeralded amplification of nonlocality via entanglement swappingYoshiaki Tsujimoto0https://orcid.org/0000-0002-7877-3797Chenglong You1https://orcid.org/0000-0002-1383-0551Kentaro Wakui2Mikio Fujiwara3Kazuhiro Hayasaka4Shigehito Miki5Hirotaka Terai6Masahide Sasaki7https://orcid.org/0000-0002-9508-570XJonathan P Dowling8Masahiro Takeoka9Advanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Koganei, Tokyo 184-8795, JapanAdvanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Koganei, Tokyo 184-8795, Japan; Hearne Institute for Theoretical Physics and Department of Physics & Astronomy, Louisiana State University , Baton Rouge, LA 70803, United States of AmericaAdvanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Koganei, Tokyo 184-8795, JapanAdvanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Koganei, Tokyo 184-8795, JapanAdvanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Koganei, Tokyo 184-8795, JapanAdvanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Kobe, Hyogo 651-2492, JapanAdvanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Kobe, Hyogo 651-2492, JapanAdvanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Koganei, Tokyo 184-8795, JapanAdvanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Koganei, Tokyo 184-8795, Japan; Hearne Institute for Theoretical Physics and Department of Physics & Astronomy, Louisiana State University , Baton Rouge, LA 70803, United States of AmericaAdvanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Koganei, Tokyo 184-8795, JapanTo observe the loophole-free violation of the Clauser–Horne–Shimony–Holt (CHSH) inequality between distant two parties, i.e. the CHSH value $S\gt 2$ , the main limitation of distance stems from the loss in the transmission channel. The entanglement swapping relay (ESR) is a simple way to amplify the signal and enables us to evade the impact of the transmission loss. Here, we experimentally test the heralded nonlocality amplifier protocol based on the ESR. We observe that the obtained probability distribution is in excellent agreement with those expected by the numerical simulation with experimental parameters which are precisely characterized in a separate measurement. Moreover, we experimentally estimate the nonlocality of the heralded state after the transmission of 10 dB loss just before final detection. The estimated CHSH value is $S=2.113\gt 2$ , which indicates that our final state possesses nonlocality even with transmission loss and various experimental imperfections. Our result clarifies an important benchmark of the ESR protocol, and paves the way towards the long-distance realization of the loophole-free CHSH-violation as well as device-independent quantum key distribution.https://doi.org/10.1088/1367-2630/ab61daBell inequalitynonlocality amplificationspontaneous parametric down conversionentanglement swapping |
| spellingShingle | Yoshiaki Tsujimoto Chenglong You Kentaro Wakui Mikio Fujiwara Kazuhiro Hayasaka Shigehito Miki Hirotaka Terai Masahide Sasaki Jonathan P Dowling Masahiro Takeoka Heralded amplification of nonlocality via entanglement swapping New Journal of Physics Bell inequality nonlocality amplification spontaneous parametric down conversion entanglement swapping |
| title | Heralded amplification of nonlocality via entanglement swapping |
| title_full | Heralded amplification of nonlocality via entanglement swapping |
| title_fullStr | Heralded amplification of nonlocality via entanglement swapping |
| title_full_unstemmed | Heralded amplification of nonlocality via entanglement swapping |
| title_short | Heralded amplification of nonlocality via entanglement swapping |
| title_sort | heralded amplification of nonlocality via entanglement swapping |
| topic | Bell inequality nonlocality amplification spontaneous parametric down conversion entanglement swapping |
| url | https://doi.org/10.1088/1367-2630/ab61da |
| work_keys_str_mv | AT yoshiakitsujimoto heraldedamplificationofnonlocalityviaentanglementswapping AT chenglongyou heraldedamplificationofnonlocalityviaentanglementswapping AT kentarowakui heraldedamplificationofnonlocalityviaentanglementswapping AT mikiofujiwara heraldedamplificationofnonlocalityviaentanglementswapping AT kazuhirohayasaka heraldedamplificationofnonlocalityviaentanglementswapping AT shigehitomiki heraldedamplificationofnonlocalityviaentanglementswapping AT hirotakaterai heraldedamplificationofnonlocalityviaentanglementswapping AT masahidesasaki heraldedamplificationofnonlocalityviaentanglementswapping AT jonathanpdowling heraldedamplificationofnonlocalityviaentanglementswapping AT masahirotakeoka heraldedamplificationofnonlocalityviaentanglementswapping |