Adding a coherent displacement to two-photon subtraction lets one distill arbitrarily strong squeezing from any pure squeezed vacuum, and a Fock filter can purify mixed inputs.
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Extended analysis of distillation and purification of squeezed states of light
Adding a coherent displacement to two-photon subtraction lets one distill arbitrarily strong squeezing from any pure squeezed vacuum, and a Fock filter can purify mixed inputs.