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Annual Review of Astronomy and Astrophysics, Volume 51, page 511e studied forcoherently driven single photon sources, such as atoms and quantum dots.Maximal squeezing is realized, if the electronic subsystem of the emitter is ina pure quantum state. The purification is achieved by using a cavity as asecond decay channel, besides the incoherent coupling to the electromagneticvacuum. For realistic cavities this yields a purity of the electronic state ofmore than 99%. Aside from numerical calculations, we also derive approximateanalytical results. Based on the approximations, effects are studied whichoriginate from the environment of the emitter, including radiationlessdephasing and incoherent pumping of the emitter and the cavity mode. Thefragility of squeezing against decoherence is substantially reduced, so thatsqueezing persists even under hostile conditions. The measurement of squeezingfrom such light sources is also considered.

Optimal Squeezing in the Resonance Fluorescence of Single Photon Emitters