Experimental Three-Particle Quantum Nonlocality under Strict Locality Conditions

Understand

Quantum correlations are critical to our understanding of nature, with far-reaching technological and fundamental impact.

• These often manifest as violations of Bell's inequalities, bounds derived from the assumptions of locality and realism, concepts integral to classical physics.
• Many tests of Bell's inequalities have studied pairs of correlated particles; however, the immense interest in multi-particle quantum correlations is driving the experimental frontier to test systems beyond just pairs.
• All experimental violations of Bell's inequalities to date require supplementary assumptions, opening the results to one or more loopholes, the closing of which is one of the most important challenges in quantum science.