Scalable multiparty steering based on a single pair of entangled qubits

• URL: http://arxiv.org/abs/2308.02296v1
• Date: Fri, 4 Aug 2023 13:01:51 GMT
• Title: Scalable multiparty steering based on a single pair of entangled qubits
• Authors: Alex Pepper, Travis. J. Baker, Yuanlong Wang, Qiu-Cheng Song, Lynden. K. Shalm, Varun. B. Varma, Sae Woo Nam, Nora Tischler, Sergei Slussarenko, Howard. M. Wiseman, Geoff. J. Pryde
• Abstract summary: We show that multiparty loophole-free quantum steering is achievable by constructing a quantum network from a set of qubits of which only one pair is entangled. This work introduces a scalable approach to rigorously verify quantum nonlocality across multiple parties, thus providing a practical tool towards developing the future quantum internet.
• Score: 0.6553834611557042
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The distribution and verification of quantum nonlocality across a network of users is essential for future quantum information science and technology applications. However, beyond simple point-to-point protocols, existing methods struggle with increasingly complex state preparation for a growing number of parties. Here, we show that, surprisingly, multiparty loophole-free quantum steering, where one party simultaneously steers arbitrarily many spatially separate parties, is achievable by constructing a quantum network from a set of qubits of which only one pair is entangled. Using these insights, we experimentally demonstrate this type of steering between three parties with the detection loophole closed. With its modest and fixed entanglement requirements, this work introduces a scalable approach to rigorously verify quantum nonlocality across multiple parties, thus providing a practical tool towards developing the future quantum internet.

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