Activation of Non-Local Quantum Resources

Abstract

We find two two-qubit states such that any number of copies of one state or the other cannot violate the CHSH Bell inequality. However, their tensor product can produce a CHSH violation of at least 2.023. We also identify a CHSH-local state such that two copies of it are CHSH-violating. The tools employed here can be easily adapted to find instances of non-locality activation in arbitrary Bell scenarios.

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Cited by in corpus (39)

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• Generalized $n$-locality inequalities in star-network configuration and their optimal quantum violations
• Nonlocality activation in entanglement swapping chains
• Certifying entangled measurements in known Hilbert spaces
• Quantum Correlations and Quantum Non-locality: a review and a few new ideas
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• Positive maps and entanglement in real Hilbert spaces
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• Genuine hidden nonlocality without entanglement: from the perspective of local discrimination
• General Method for Classicality Certification in the Prepare and Measure Scenario
• Single-copy activation of Bell nonlocality via broadcasting of quantum states
• Conditional quantum nonlocality in dimeric and trimeric arrays of organic molecules
• Measure-independent anomaly of nonlocality
• Family of Bell inequalities violated by higher-dimensional bound entangled states
• Multiphoton Bell-type inequality: a tool to unearth nonlocality of continuous variable quantum optical systems
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• Revealing Hidden Genuine Tripartite Nonlocality
• Necessary and sufficient conditions for multipartite Bell violations with only one trusted device
• Channel Activation of CHSH Nonlocality
• On the Activation of Quantum Nonlocality
• Bell Nonlocality in Classical Systems Coexisting with other System Types
• Entanglement versus Bell nonlocality of quantum nonequilibrium steady states
• The Schmidt number of a quantum state cannot always be device-independently certified
• Hidden Steering Nonlocality in Quantum Networks
• Iterative optimization in quantum metrology and entanglement theory using semidefinite programming
• Catalytic Activation of Bell Nonlocality
• Geometric measures of quantum nonlocality: characterization, quantification, and comparison by distances and operations
• Bound entanglement-assisted prepare-and-measure scenarios based on four-dimensional quantum messages
• Incompatibility of optimized protection of entanglement and teleportation fdelity in the presence of decoherence