Entanglement Swapping and Quantum Correlations via Symmetric Joint Measurements

Huang, Cen-Xiao; Hu, Xiaomin; Guo, Yu; Zhang, Chao; Liu, Bi-Heng; Huang, Yun‐Feng; Li, Chuan‐Feng; Guo, Guang‐Can; Gisin, Nicolas; Branciard, Cyril; Tavakoli, Armin

doi:10.1103/physrevlett.129.030502

Cited by 26 publications

(9 citation statements)

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“…Similarly, we find via measurement tomography a fidelity of 0.8205 ± 0.0040 for the three-qubit GHZ projection in the node. Finally, to evidence the independence of the sources not only in the experimental setup but also in the data, we have performed additional measurements, experimentally determining the marginal probabilities p ( a i , a j ∣ x i , x j ), and computed their mutual information 31 , 39 . As we show in Supplementary Table 1 , we find that the mutual information very nearly vanishes in all cases, as expected from truly independent sources.…”

Section: Resultsmentioning

confidence: 99%

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Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics

et al. 2023

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Networks composed of independent sources of entangled particles that connect distant users are a rapidly developing quantum technology and an increasingly promising test-bed for fundamental physics. Here we address the certification of their post-classical properties through demonstrations of full network nonlocality. Full network nonlocality goes beyond standard nonlocality in networks by falsifying any model in which at least one source is classical, even if all the other sources are limited only by the no-signaling principle. 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. Our results demonstrate that experimental observation of full network nonlocality beyond the bilocal scenario is possible with current technology.

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Section: Resultsmentioning

confidence: 99%

“…The full nonlocality reported in ref. 39 uses sophisticated entangled measurements but ought to be understood as a proof-of-principle since qubits that should be macroscopically separated, as in real networks, are encoded onto the same photon. The very recent demonstration reported in ref.…”

Section: Introductionmentioning

confidence: 99%

Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics

et al. 2023

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“…Therefore, all average values ( 6) and ( 7) depending on different measurements of any three observers can be easily calculated from (14). It is possible to check whether the KGT inequalities are violated or not.…”

Section: ĉMmentioning

confidence: 99%

“…This is evidently a rather trivial form of network correlation, lacking any new valuable physical implications. Excluding network structures that mimic standard Bell nonlocality forms remains a central and highly challenging issue in this field [1,13,14]. In 2022, Pozas-Kerstjens et al [13] elucidated the concept of full network nonlocality (FNN), describing the correlation where all links in the network must share nonlocality resources.…”

Section: Introductionmentioning

confidence: 99%

Full network nonlocality sharing in extended bilocal scenario via weak measurements with the optimal pointer

Cai,

Ren

2024

J. Phys. A: Math. Theor.

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Quantum networks, which can exceed the framework of the standard Bell theorem, ﬂourish the investigation of quantum nonlocality further. Recently, a concept of full quantum network nonlocality (FNN) which is stronger than network nonlocality (NN), has been deﬁned and can be witnessed by Kerstjens-Gisin-Tavakoli (KGT) inequalities [Phys. Rev. Lett. 128, 010403 (2022)]. In this letter, we explored the recycling of FNN as quantum resources by analyzing the FNN sharing between diﬀerent combinations of observers. The FNN sharing in an extended bilocal scenario (consisting of two independent 2-qubit quantum states as sources) via weak measurements has been completely discussed. According to the diﬀerent motivations of the observer-Charlie1, two types of possible FNN sharing, passive FNN sharing and active FNN sharing, can be investigated by checking the simultaneous violation of KGT inequalities between Alice-Bob-Charlie1 and Alice-Bob-Charlie2. Our results show that passive FNN sharing is impossible while active FNN sharing can be achieved by proper measurements, which indicates that FNN sharing in this scenario requires more cooperation by the intermediate observers compared with Bell nonlocality sharing and network nonlocality sharing.sharing.

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“…They enable interesting new possibilities: stronger [36,38] and novel forms [39] of entanglement-swapping, nonlocality without inputs [40], limitations on measurement dependence [41] and distinguishing the role of complex numbers in quantum theory [42]. This has motivated many network nonlocality experiments [43][44][45][46][47][48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Recycling nonlocality in a quantum network

Mao

Steffinlongo

et al. 2022

Preprint

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The nonlocality of an entangled qubit pair can be recycled for several Bell experiments. Here, we go beyond standard Bell scenarios and investigate the recycling of nonlocal resources in a quantum network. First, we show that the ability to recycle nonlocality can be independent of the size of the network. Then, we realize a photonic quantum 3-branch star network in which three sources of entangled pairs independently connect three outer parties with a central node. After measuring, each outer party respectively relays their system to an independent secondary measuring party. We experimentally demonstrate that the outer parties can perform unsharp measurements that are strong enough to violate a network Bell inequality with the central party, but weak enough to maintain sufficient entanglement in the network to allow the three secondary parties to do the same. Moreover, the violations are strong enough to exclude any model based on standard projective measurements on the EPR pairs emitted in the network. Our experiment brings together the research program of recycling quantum resources with that of Bell nonlocality in networks.

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Entanglement Swapping and Quantum Correlations via Symmetric Joint Measurements

Cited by 26 publications

References 50 publications

Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics

Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics

Full network nonlocality sharing in extended bilocal scenario via weak measurements with the optimal pointer

Recycling nonlocality in a quantum network

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