Introduction to generation, manipulation and characterization of optical quantum states

Abstract

Why do we need quantization to describe vision? What are the quadrature operators of the electromagnetic field? Is it possible to measure them? What are the characteristic functions useful for? In this brief tutorial we provide the theoretical tools needed to describe the generation, manipulation and characterization of optical quantum states and of the main passive (beam splitters) and active (squeezers) devices involved in experiments, such as the Hong-Ou-Mandel interferometer and the continuous-variable quantum teleportation. We also introduce the concept of operator ordering and the description of a system by means of the $p$-ordered characteristic functions. Then we focus on the quasi-probability distributions and, in particular, on the relation between the marginals of the Wigner function and the outcomes of the quadrature operator measurement. Finally, we introduce the balanced homodyne detection to measure the quadrature operator and the homodyne tomography as a tool for characterizing quantum optical states also in the presence of non-unit quantum efficiency.

arXiv comment16 pages, 10 figures. This is not a review paper and, thus, we have chosen to cite only few necessary references that the reader can use to improve the study. This is just a tutorial, with useful examples and simple exercises

References in corpus (12)

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• Probabilistic amplitude shaping for continuous-variable quantum key distribution with discrete modulation over a wiretap channel
• Cost-effective temperature estimation strategies for thermal states with probabilistic quantum metrology
• Novel technique for the active stabilization of the relative phase between seed and pump in an optical parametric oscillator
• Entanglement recovery in noisy binary quantum information protocols via three-qubit quantum error correction codes