Novel Macroscopic Violation of a Cauchy Schwarz Inequality Using Bunched and Unbunched Twin Beams

Abstract

We have demonstrated unequivocal macroscopic violations of the Cauchy Schwarz inequality^l: [g ⁽²⁾₁₂ (t)]² ≤ g ⁽²⁾₁₁ (0)g ⁽²⁾₂₂ (0), for both hunched and antihunched incoherent light using a series connected pair of infrared emitting diodes² to generate intensity-correlated twin beams of variable Fano factor, 30 > F _i > 0.05. These results show clearly that the macroscopic violation is a fundamental quantum phenomenon, fully consistent with the “classical particle” model of incoherent light beam splitting suggested by Paul³.