Quantum Correlations beyond Entanglement and Discord

Dissimilar notions of quantum correlations have been established, each being motivated through particular applications in information science and competing for recognized as the most relevant measure quantumness. In this contribution, we experimentally realize a form correlation that exists even absence entanglement discord. We certify presence such via negativities regularized two-mode Glauber-Sudarshan function. Our data show compatibility with an incoherent mixture orthonormal photon-number states, ruling out coherence other kinds resources. By construction, quantumness our state is robust against dephasing, thus requiring fewer experimental resources to ensure stability. addition, theoretically how multimode can be activated based on generated, nonentangled state. Therefore, implement kind nonclassical photon-photon correlated useful processing.