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The behaviour of quantum open systems, and their output response, when drivenby quantum input noise in a nonclassical state is of key importance to quantumtechnology. Here we give explicit constructions of quantum modulating filterswhich generate desired nonclassical states (coherent states, cat states, shapedsingle and multi-photon states) of quantum optical fields from vacuum noiseinput. The nonclassical state features (coherence, entanglement, Fock state,etc.) of the modulating filter, itself a linear passive open system, aretransferred to the continuous variable output field state. The filter dynamicsmay additionally shape the output to obtain specific target states. It is shownthat the open dynamics of a general quantum Markov system driven by thesenonclassical inputs is equivalent to the cascaded filter-plus-system model withvacuum field inputs.

Generating Nonclassical Quantum Input Field States with Modulating Filters