Generating Nonclassical Quantum Input Field States with Modulating Filters

Abstract

The behaviour of quantum open systems, and their output response, when driven by quantum input noise in a nonclassical state is of key importance to quantum technology. Here we give explicit constructions of quantum modulating filters which generate desired nonclassical states (coherent states, cat states, shaped single and multi-photon states) of quantum optical fields from vacuum noise input. The nonclassical state features (coherence, entanglement, Fock state, etc.) of the modulating filter, itself a linear passive open system, are transferred to the continuous variable output field state. The filter dynamics may additionally shape the output to obtain specific target states. It is shown that the open dynamics of a general quantum Markov system driven by these nonclassical inputs is equivalent to the cascaded filter-plus-system model with vacuum field inputs.

8 pages, 2 figures (paper extended to include the equivalence results for the whole input-system-output model, and not just the Heisenberg dynamics)

References in corpus (4)

• Generation of a superposition of odd photon number states for quantum information networks
• Generating Single Microwave Photons in a Circuit
• Quantum Feedback Networks: Hamiltonian Formulation
• Quantum Trajectories for a Class of Continuous Matrix Product Input States

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