  In this work, a theoretical generalization of Lloyd's quantum illumination to
signal beams described by two entangled photon states is developed. It is shown
that the new protocol offers a method to find the range of the target, reduces
the size of the required time-bandwidth product to have the same signal to
noise ratio than in Lloyd's quantum illumination, has a lower probability of
false positive and is resilient against noise and also potentially against
losses. However, the generation of the required three photon states for the
protocol posses a technical problem for its practical implementation not fully
addressed. Recent advances in triple photon generation that can overcome this
problem are discussed. Other issues related with the protocol are also
considered.
