  Quantum entanglement is known as a unique feature of quantum mechanics, which
cannot be obtained from classical physics. Recently, a coherence interpretation
has been conducted for the delayed-choice quantum eraser using coherent photon
pairs, where phase-locked symmetric frequency detuning between paired photons
plays an essential role for selective measurement-caused nonlocal correlation.
Here, a macroscopic version of the nonlocal correlation is presented using
orthogonally polarized optical fields in a continuous wave quantum eraser
scheme in a Mach-Zehnder interferometer (MZI). The resulting polarization
projection of each MZI output fields onto a rotated polarizer satisfies the
violation of the cause-effect relation. Based on this macroscopic quantum
eraser, the intensity product between two projected output fields satisfies the
inseparable joint-parameter relation if the intensity product is selectively
measured through a low pass filter to block beating signals between them.
