Extending quantum correlations to arbitrary distances via parallel repetition of routed Bell tests
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Acceso en línea: | |
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| _version_ | 1866912344820416512 |
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| author | Chaturvedi, Anubhav Pawłowski, Marcin Farkas, Máté |
| author_facet | Chaturvedi, Anubhav Pawłowski, Marcin Farkas, Máté |
| contents | Applications such as Device-Independent Quantum Key Distribution (DIQKD) require loophole-free certification of long-distance quantum correlations. However, these distances remain severely constrained by detector inefficiencies and unavoidable transmission losses. To overcome this challenge, we consider parallel repetitions of the recently proposed routed Bell experiments, where transmissions from the source are actively directed either to a nearby or a distant measurement device. We analytically show that the threshold detection efficiency of the distant device--needed to certify non-jointly-measurable measurements, a prerequisite of secure DIQKD--decreases exponentially, optimally, and robustly, following $η^*=1/2^N$, with the number $N$ of parallel repetitions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_17621 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Extending quantum correlations to arbitrary distances via parallel repetition of routed Bell tests Chaturvedi, Anubhav Pawłowski, Marcin Farkas, Máté Quantum Physics Applications such as Device-Independent Quantum Key Distribution (DIQKD) require loophole-free certification of long-distance quantum correlations. However, these distances remain severely constrained by detector inefficiencies and unavoidable transmission losses. To overcome this challenge, we consider parallel repetitions of the recently proposed routed Bell experiments, where transmissions from the source are actively directed either to a nearby or a distant measurement device. We analytically show that the threshold detection efficiency of the distant device--needed to certify non-jointly-measurable measurements, a prerequisite of secure DIQKD--decreases exponentially, optimally, and robustly, following $η^*=1/2^N$, with the number $N$ of parallel repetitions. |
| title | Extending quantum correlations to arbitrary distances via parallel repetition of routed Bell tests |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2504.17621 |