Nonlocality activation in a photonic quantum network

• URL: http://arxiv.org/abs/2309.06501v2
• Date: Tue, 7 May 2024 02:50:06 GMT
• Title: Nonlocality activation in a photonic quantum network
• Authors: Luis Villegas-Aguilar, Emanuele Polino, Farzad Ghafari, Marco Túlio Quintino, Kiarn Laverick, Ian R. Berkman, Sven Rogge, Lynden K. Shalm, Nora Tischler, Eric G. Cavalcanti, Sergei Slussarenko, Geoff J. Pryde,
• Abstract summary: Bell nonlocality is crucial for device-independent technologies like quantum key distribution and randomness generation. We show that single copies of Bell-local states can give rise to nonlocality after being embedded into a quantum network of multiple parties. Our findings have fundamental implications for nonlocality and enable the practical use of nonlocal correlations in real-world applications.
• Score: 0.44270590458998854
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Bell nonlocality refers to correlations between two distant, entangled particles that challenge classical notions of local causality. Beyond its foundational significance, nonlocality is crucial for device-independent technologies like quantum key distribution and randomness generation. Nonlocality quickly deteriorates in the presence of noise, and restoring nonlocal correlations requires additional resources. These often come in the form of many instances of the input state and joint measurements, incurring a significant resource overhead. Here, we experimentally demonstrate that single copies of Bell-local states, incapable of violating any standard Bell inequality, can give rise to nonlocality after being embedded into a quantum network of multiple parties. We subject the initial entangled state to a quantum channel that broadcasts part of the state to two independent receivers and certify the nonlocality in the resulting network by violating a tailored Bell-like inequality. We obtain these results without making any assumptions about the prepared states, the quantum channel, or the validity of quantum theory. Our findings have fundamental implications for nonlocality and enable the practical use of nonlocal correlations in real-world applications, even in scenarios dominated by noise.

Related papers

• Quantum Nonlocality: Multi-copy Resource Inter-convertibility & Their Asymptotic Inequivalence [0.0]
  We present instances of quantum nonlocal correlations that are incomparable in the strongest sense. Remarkably, these incomparable quantum correlations can be obtained even in the simplest Bell scenario. Our result challenges the notion of a 'unique gold coin', often referred to as the'maximally resourceful state'
  arXiv  Detail & Related papers  (2023-10-25T05:57:44Z)
• Detecting Nontrilocal Correlations In Triangle Networks [0.0]
  Correlations in quantum networks with independent sources exhibit a completely novel form of nonclassicality. A set of criteria is framed in the form of Bell-type inequalities, each of which is necessarily satisfied by trilocal correlations. measurement on a local product state basis turns out to be sufficient to generate nontrilocal correlations in some quantum networks.
  arXiv  Detail & Related papers  (2023-03-15T16:25:32Z)
• Bell inequalities with overlapping measurements [52.81011822909395]
  We study Bell inequalities where measurements of different parties can have overlap. This allows to accommodate problems in quantum information. The scenarios considered show an interesting behaviour with respect to Hilbert space dimension, overlap, and symmetry.
  arXiv  Detail & Related papers  (2023-03-03T18:11:05Z)
• Experimental full network nonlocality with independent sources and strict locality constraints [59.541438315564854]
  Nonlocality in networks gives rise to phenomena radically different from that in standard Bell scenarios. We experimentally observe full network nonlocality in a network where the source-independence, locality, and measurement-independence loopholes are closed. Our experiment violates known inequalities characterizing non-full network nonlocal correlations by over five standard deviations.
  arXiv  Detail & Related papers  (2023-02-05T20:03:58Z)
• Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics [52.95080735625503]
  Full network nonlocality goes beyond standard nonlocality in networks by falsifying any model in which at least one source is classical. We report on the observation of full network nonlocality in a star-shaped network featuring three independent sources of photonic qubits and joint three-qubit entanglement-swapping measurements.
  arXiv  Detail & Related papers  (2022-12-19T19:00:01Z)
• Sharing Quantum Nonlocality in Star Network Scenarios [0.0]
  The nonlocality of quantum network states is more complex than the Bell nonlocality. For the star network scenarios, we present for the first time comprehensive results on the nonlocality sharing properties of quantum network states.
  arXiv  Detail & Related papers  (2022-10-12T07:50:19Z)
• Single-photon nonlocality in quantum networks [55.41644538483948]
  We show that the nonlocality of single-photon entangled states can nevertheless be revealed in a quantum network made only of beamsplitters and photodetectors. Our results show that single-photon entanglement may constitute a promising solution to generate genuine network-nonlocal correlations useful for Bell-based quantum information protocols.
  arXiv  Detail & Related papers  (2021-08-03T20:13:24Z)
• Genuine network quantum nonlocality and self-testing [0.0]
  We define a notion of genuine network quantum nonlocality. We show several examples of correlations that are genuine network nonlocal. In particular, we present an example of quantum self-testing which relies on the network structure.
  arXiv  Detail & Related papers  (2021-05-26T06:05:22Z)
• Full network nonlocality [68.8204255655161]
  We introduce the concept of full network nonlocality, which describes correlations that necessitate all links in a network to distribute nonlocal resources. We show that the most well-known network Bell test does not witness full network nonlocality. More generally, we point out that established methods for analysing local and theory-independent correlations in networks can be combined in order to deduce sufficient conditions for full network nonlocality.
  arXiv  Detail & Related papers  (2021-05-19T18:00:02Z)
• Bell nonlocality in networks [62.997667081978825]
  Bell's theorem proves that quantum theory is inconsistent with local physical models. In the last decade, the investigation of nonlocality has moved beyond Bell's theorem to consider more sophisticated experiments. This review discusses the main concepts, methods, results and future challenges in the emerging topic of Bell nonlocality in networks.
  arXiv  Detail & Related papers  (2021-04-21T18:00:48Z)
• Unbounded Bell violations for quantum genuine multipartite non-locality [0.5156484100374058]
  Bell inequalities by measurements on quantum states give rise to the phenomenon of quantum non-locality. We show that while in the so-called correlation scenario the relative violation of bilocal Bell inequalities by quantum resources is bounded, it does not grow arbitrarily with the number of inputs. We identify Bell functionals that take the form of non-local games for which the ratio of the quantum and bilocal values grows unboundedly as a function of the number of inputs and outputs.
  arXiv  Detail & Related papers  (2020-02-28T09:28:27Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.