  Quantum entanglement is known as a unique quantum feature that cannot be
obtained by classical physics. Over the last several decades, however, such an
understanding on quantum entanglement might have confined us in a limited world
of weird quantum mechanics. Unlike a single photon, a definite phase relation
between paired photons is the key to understanding quantum features. Recently,
an intuitive approach to the otherwise mysterious quantum features has emerged
and shined a light on coherence manipulations of product-basis superposition
via selective measurements. Here, a coherence manipulation is presented to
excite polarization-path correlation using Poisson-distributed coherent photons
for a classically excited joint-phase relation of independent local parameters.
For this, linear optics is used for the preparation of the polarization-basis
randomness, and a gated heterodyne detection technique is adopted for the
selective measurement of polarization bases. As a result, the nonlocal quantum
feature is now coherently understood in a deterministic way.
