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Intrinsic quantum correlations of weak coherent states are observed betweentwo parties through a novel detection scheme, which can be used as a supplementto the existence decoy-state BB84 and differential phase-shift quantum keydistribution (DPS-QKD) protocols. In a proof-of-principle experiment, wegenerate bi-partite correlations of weak coherent states using weak localoscillator fields in two spatially separated balanced homodyne detections. Weemploy nonlinearity of post-measurement method to obtain the bi-partitecorrelations from two single-field interferences at individual homodynemeasurement.  This scheme is then used to demonstrate bits correlations between two partiesover a distance of 10 km through a transmission fiber. We believe that thescheme can add another physical layer of security to these protocols forquantum key distribution.

Intrinsic Quantum Correlations of Weak Coherent States for Quantum Communication