Observations of Deterministic Quantum Correlation Using Coherent Light

Complementarity theory is the essence of the Copenhagen interpretation in quantum mechanics. Since the Hanbury Brown and Twiss experiments, the particle nature of photons has been intensively studied for various quantum phenomena such as anticorrelation and Bell inequality violation over the last several decades. Regarding the quantum features based on the particle nature of photons, however, no clear answer exists for how to generate such an entangled photon pair or what causes the maximum correlation between them. Here, we experimentally demonstrate the physics of quantumness on anticorrelation using well defined and nearly sub-Poisson distributed coherent photons, where a particular photon number is post-selected using a photon resolving coincidence measurement technique. As a results, unprecedented wavelength dependent first-order intensity correlation has been observed in the two-photon second-order intensity correlation with 99.9 % visibility, where this result demonstrates the anticorrelation theory in Scientific Reports 10 , 7309 (2020) and opens the door to the on-demand quantum correlation control.