Extending loophole-free nonlocal correlations to arbitrarily large distances
Abstract Quantum theory allows spatially separated observers to share nonlocal correlations, which enable them to accomplish classically inconceivable information processing and cryptographic feats. However, the distances over which nonlocal correlations can be realized remain severely limited due t...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2024-01-01
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| Series: | npj Quantum Information |
| Online Access: | https://doi.org/10.1038/s41534-023-00799-1 |
| _version_ | 1827382067872137216 |
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| author | Anubhav Chaturvedi Giuseppe Viola Marcin Pawłowski |
| author_facet | Anubhav Chaturvedi Giuseppe Viola Marcin Pawłowski |
| author_sort | Anubhav Chaturvedi |
| collection | DOAJ |
| description | Abstract Quantum theory allows spatially separated observers to share nonlocal correlations, which enable them to accomplish classically inconceivable information processing and cryptographic feats. However, the distances over which nonlocal correlations can be realized remain severely limited due to their high fragility to noise and high threshold detection efficiencies. To enable loophole-free nonlocality across large distances, we introduce Bell experiments wherein the spatially separated parties randomly choose the location of their measurement devices. We demonstrate that when devices close to the source are perfect and witness extremal nonlocal correlations, such correlations can be extended to devices placed arbitrarily far from the source. To accommodate imperfections close to the source, we demonstrate an analytic trade-off: the higher the loophole-free nonlocality close to the source, the lower the threshold requirements away from the source. We utilize this trade-off and formulate numerical methods to estimate the critical requirements of individual measurement devices in such experiments. |
| first_indexed | 2024-03-08T14:14:09Z |
| format | Article |
| id | doaj.art-65d8d0c3622a4dd2a3a69ad9c0a5f1db |
| institution | Directory Open Access Journal |
| issn | 2056-6387 |
| language | English |
| last_indexed | 2024-03-08T14:14:09Z |
| publishDate | 2024-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Information |
| spelling | doaj.art-65d8d0c3622a4dd2a3a69ad9c0a5f1db2024-01-14T12:31:39ZengNature Portfolionpj Quantum Information2056-63872024-01-011011910.1038/s41534-023-00799-1Extending loophole-free nonlocal correlations to arbitrarily large distancesAnubhav Chaturvedi0Giuseppe Viola1Marcin Pawłowski2Faculty of Applied Physics and Mathematics, Gdańsk University of TechnologyInternational Centre for Theory of Quantum Technologies (ICTQT), University of GdańskInternational Centre for Theory of Quantum Technologies (ICTQT), University of GdańskAbstract Quantum theory allows spatially separated observers to share nonlocal correlations, which enable them to accomplish classically inconceivable information processing and cryptographic feats. However, the distances over which nonlocal correlations can be realized remain severely limited due to their high fragility to noise and high threshold detection efficiencies. To enable loophole-free nonlocality across large distances, we introduce Bell experiments wherein the spatially separated parties randomly choose the location of their measurement devices. We demonstrate that when devices close to the source are perfect and witness extremal nonlocal correlations, such correlations can be extended to devices placed arbitrarily far from the source. To accommodate imperfections close to the source, we demonstrate an analytic trade-off: the higher the loophole-free nonlocality close to the source, the lower the threshold requirements away from the source. We utilize this trade-off and formulate numerical methods to estimate the critical requirements of individual measurement devices in such experiments.https://doi.org/10.1038/s41534-023-00799-1 |
| spellingShingle | Anubhav Chaturvedi Giuseppe Viola Marcin Pawłowski Extending loophole-free nonlocal correlations to arbitrarily large distances npj Quantum Information |
| title | Extending loophole-free nonlocal correlations to arbitrarily large distances |
| title_full | Extending loophole-free nonlocal correlations to arbitrarily large distances |
| title_fullStr | Extending loophole-free nonlocal correlations to arbitrarily large distances |
| title_full_unstemmed | Extending loophole-free nonlocal correlations to arbitrarily large distances |
| title_short | Extending loophole-free nonlocal correlations to arbitrarily large distances |
| title_sort | extending loophole free nonlocal correlations to arbitrarily large distances |
| url | https://doi.org/10.1038/s41534-023-00799-1 |
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