Experimental full network nonlocality with independent sources and strict locality constraints

Abstract

Nonlocality arising in networks composed of several independent sources gives rise to phenomena radically different from that in standard Bell scenarios. Over the years, the phenomenon of network nonlocality in the entanglement-swapping scenario has been well investigated and demonstrated. However, it is known that violations of the so-called bilocality inequality used in previous experimental demonstrations cannot be used to certify the non-classicality of their sources. This has put forward a stronger concept for nonlocality in networks, called full network nonlocality. Here, we experimentally observe full network nonlocal correlations in a network where the source-independence, locality, and measurement-independence loopholes are closed. This is ensured by employing two independent sources, rapid setting generation, and space-like separations of relevant events. Our experiment violates known inequalities characterizing non-full network nonlocal correlations by over five standard deviations, certifying the absence of classical sources in the realization.

arXiv comment11 pages, 7 figures, RevTeX 4.2. V2: Updated to match published version

References in corpus (30)

• Experimental loophole-free violation of a Bell inequality using entangled electron spins separated by 1.3 km
• Bell nonlocality
• Device-independent security of quantum cryptography against collective attacks
• Significant-loophole-free test of Bell's theorem with entangled photons
• Random Numbers Certified by Bell's Theorem
• A strong loophole-free test of local realism
• Towards optimal single-photon sources from polarized microcavities
• Event-Ready Bell Test Using Entangled Atoms Simultaneously Closing Detection and Locality Loopholes
• Certified randomness in quantum physics
• Characterizing the nonlocal correlations of particles that never interacted
• Bilocal versus non-bilocal correlations in entanglement swapping experiments
• Device independent quantum random number generation
• Nonlocal correlations in the star-network configuration
• Quantum nonlocality, Bell inequalities and the memory loophole
• Generation of fresh and pure random numbers for loophole-free Bell tests
• The Inflation Technique for Causal Inference with Latent Variables
• Testing Local Realism into the Past without Detection and Locality Loopholes
• Experimental demonstration of non-bilocal quantum correlations
• Experimental non-locality in a quantum network
• Maximal violation of n-locality inequalities in a star-shaped quantum network
• Constraints on nonlocality in networks from no-signaling and independence
• Towards device-independent information processing on general quantum networks
• Quantum Inflation: A General Approach to Quantum Causal Compatibility
• Entanglement swapping and quantum correlations via Elegant Joint Measurements
• Experimental demonstration of nonbilocality with truly independent sources and strict locality constraints
• Correlations in star networks: from Bell inequalities to network inequalities
• Experimental bilocality violation without shared reference frames
• Experimental refutation of real-valued quantum mechanics under strict locality conditions
• Locality and Bell's inequality
• Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics

Cited by in corpus (11)

• Semidefinite programming relaxations for quantum correlations
• Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics
• Hierarchical certification of nonclassical network correlations
• Proposals for ruling out the real quantum theories in an entanglement-swapping quantum network with causally independent sources
• Classification of joint quantum measurements based on entanglement cost of localization
• Consequences of the single-pair measurement of the Bell parameter
• Scalable Determination of Multipartite Entanglement in Quantum Networks
• A universal scheme to self-test any quantum state or measurement
• Experimental quantum triangle network nonlocality with an AlGaAs multiplexed entangled photon source
• Guarantees on the structure of experimental quantum networks
• Experimental genuine quantum nonlocality in the triangle network