Classical Communication via the Einstein-Podolsky-Rosen Channel Alone: A Proposed Experimental Test

We uncover an apparent instance of classical information transfer via only the Einstein-Podolsky-Rosen channel in a quantum optical protocol between Alice and Bob, involving two-photon maximal path entanglement and based on a recent Innsbruck experiment. The signal is traced to the appearance of coherent reduction due to the onset of spatial degeneracy in the eigenvalue spectrum for Alice's measurement. We present our result primarily as an issue for experimental testing rather than as a definitive prediction at this stage.