Certification of quantum correlations and DIQKD at arbitrary distances through routed Bell tests

• URL: http://arxiv.org/abs/2502.12241v1
• Date: Mon, 17 Feb 2025 19:00:01 GMT
• Title: Certification of quantum correlations and DIQKD at arbitrary distances through routed Bell tests
• Authors: Pavel Sekatski, Jef Pauwels, Edwin Peter Lobo, Stefano Pironio, Nicolas Brunner,
• Abstract summary: We investigate the recently proposed concept of routed Bell experiments, in which one party can perform measurements either near or far from the source. We prove that routed Bell tests can certify quantum correlations for arbitrary loss on the channel to the distant device, using only entangled qubits. We present a DIQKD protocol for the routed Bell scenario that can operate over arbitrary distances.
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• Abstract: Transmission loss represents a major obstacle for the demonstration of quantum Bell nonlocality over long distances and applications that rely on it, such as Device-Independent Quantum Key Distribution. In this work, we investigate the recently proposed concept of routed Bell experiments, in which one party can perform measurements either near or far from the source. We prove that routed Bell tests can certify quantum correlations for arbitrary loss on the channel to the distant device, using only entangled qubits. This is achieved by applying the concepts of self-testing and quantum steering to routed Bell tests. Finally, we present a DIQKD protocol for the routed Bell scenario that can operate over arbitrary distances.

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