Entanglement swapping and quantum correlations via Elegant Joint Measurements

Abstract

We use hyper-entanglement to experimentally realize deterministic entanglement swapping based on quantum Elegant Joint Measurements. These are joint projections of two qubits onto highly symmetric, iso-entangled, bases. We report measurement fidelities no smaller than $97.4\%$. We showcase the applications of these measurements by using the entanglement swapping procedure to demonstrate quantum correlations in the form of proof-of-principle violations of both bilocal Bell inequalities and more stringent correlation criteria corresponding to full network nonlocality. Our results are a foray into entangled measurements and nonlocality beyond the paradigmatic Bell state measurement and they show the relevance of more general measurements in entanglement swapping scenarios.

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Cited by in corpus (27)

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• Iso-entangled bases and joint measurements
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• Inferring physical properties of symmetric states from the fewest copies
• Regarding the Maximal Qubit Violations of n-Locality in Star and Chain Networks
• Proposals for ruling out the real quantum theories in an entanglement-swapping quantum network with causally independent sources
• Correspondence between entangled states and entangled bases under local transformations
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• Randomness versus Nonlocality in Multi-input and Multi-output Quantum Scenario
• Symmetric quantum joint measurements on multiple qubits
• A more generalized two-qubit symmetric quantum joint measurement
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• Detector entanglement: Quasidistributions for Bell-state measurements
• Non-locality of conjugation symmetry: characterization and examples in quantum network sensing
• Experimental Catalytic Amplification of Asymmetry
• Towards scalable active steering protocols for genuinely entangled state manifolds
• The Multiqubit Elegant Joint Measurement
• Experimental genuine quantum nonlocality in the triangle network
• Entanglement concentration via measurement:- role of imaginarity