Quantum illumination receiver using double homodyne detection

A quantum receiver is an essential element of illumination (QI) which outperforms its classical counterpart, called classical-illumination (CI). However, there are only few proposals for realizable receiver, exploits nonlinear effects leading to increasing the complexity setups. To compensate this, in this article, we design a with linear optical elements Gaussian QI. Rather than exploiting effect, our consists 50:50 beam splitter and homodyne detection. Using double detection after splitter, analyze performance QI different regimes target reflectivity, source power, noise level. We show that has better signal-to-noise ratio more robust against existing simple-structured receivers.