does not utilize correlation. Moreover, we show that the semiconductor waveguide source is suitable for practical implementations due to its flexible tailorability and potential in high-density integration.

CORRELATION ENHANCED TARGET DETECTION
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The general schematic of correlation enhanced target detection protocols consists of three sections: *source*, *transceiver*, and *detection*, as shown in Fig. \[SETUP\]. In the source section, the non-classical probe and reference light are generated and separated (through, for example, wavelength or polarization demultiplexing). The probe and reference light could be (simultaneously) correlated in many degree of freedoms, such as such as time, frequency and intensity, etc. The probe light is sent to probe the target in the transceiver section. The back-reflected light from the target object (none if the target object is absent) is collected for detection in the detection section. Despite the presence of the target object, strong background noise always couples into the detection section and gets detected. The background noise is assumed to be continuous-wave (CW) and broadband white noise that is completely uncorrelated with the reference light. The reference light is directly sent to the detection section and get detected. The optical path lengths of the reference and probe light do not have to 