Experimental bilocality violation without shared reference frames

Abstract

Non-classical correlations arising in complex quantum networks are attracting growing interest, both from a fundamental perspective and for potential applications in information processing. In particular, in an entanglement swapping scenario a new kind of correlations arise, the so-called nonbilocal correlations that are incompatible with local realism augmented with the assumption that the sources of states used in the experiment are independent. In practice, however, bilocality tests impose strict constraints on the experimental setup and in particular to presence of shared reference frames between the parties. Here, we experimentally address this point showing that false positive nonbilocal quantum correlations can be observed even though the sources of states are independent. To overcome this problem, we propose and demonstrate a new scheme for the violation of bilocality that does not require shared reference frames and thus constitute an important building block for future investigations of quantum correlations in complex networks.

10 pages

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Cited by in corpus (27)

• Bell nonlocality in networks
• Computationally Efficient Nonlinear Bell Inequalities for General Quantum Networks
• Maximal violation of n-locality inequalities in a star-shaped quantum network
• Machine learning non-local correlations
• Towards device-independent information processing on general quantum networks
• Experimental demonstration of nonbilocality with truly independent sources and strict locality constraints
• Analysing quantum systems with randomised measurements
• Generalized $n$-locality inequalities in star-network configuration and their optimal quantum violations
• Experimental robust self-testing of the state generated by a quantum network
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• Characterizing nonlocal correlations through various $n$-locality inequlities in quantum network
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