Test of squeezing and coherence of a single-mode cavity field
W. Vogel, D.‐G. Welsch, Lutz Leine · Journal of the Optical Society of America B · 1987
It is shown that off-diagonal elements of the photon density matrix of a single-mode cavity field can be determined by using test atoms that are initially prepared in a coherent superposition of the two states interacting with the cavity mode. In particular, this makes it possible to test the cavity field with respect to squeezing.