It is shown that a three-level system with suitable values of electromagnetic coupling between the levels is capable of absorbing the photon of a one-photon state in a squeezed mode but not of the photons of the two-photon state in this same mode, allowing reconstruction of the squeezing of a previously squeezed state degradated by losses. Also a dissipative version is proposed in which the intermediate level is coupled to a continuum which dumps out the oscillation due to the filter precessions. © 1994.
Garreau, J. C. (1994). Reconstruction of squeezing by a three-level quantum filter. Optics Communications, 110(1–2), 228–238. https://doi.org/10.1016/0030-4018(94)90199-6