  We examine the question of coherent perfect absorption (CPA) of single
photons, and more generally, of the quantum fields by a {\it macroscopic}
medium. We show the CPA of path entangled single photons in a Fabry-Perot
interferometer containing an absorptive medium. The frequency of perfect
absorption can be controlled by changing the interferometer parameters like the
reflectivity and the complex dielectric constant of the material. We exhibit
similar results for path entangled photons in micro-ring resonators. For
entangled fields like the ones produced by a down converter the CPA aspect is
evident in phase sensitive detection schemes such as in measurements of the
squeezing spectrum.
