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Tomographie par trajectoires d'états délocalisés du champ micro-onde de deux cavités

Abstract : Quantum state estimation, or tomography, is a key component of quantum technologies, allowing to characterise quantum operations and to extract information on the results of quantum information processes. The usual tomography techniques rely on ideal, single-shot measurements of the unknown state. In this work, we use a new approach, called trajectory quantum tomography, where the quantum trajectory of each realization of the state is recorded through a series of measurements, including experimental imperfections and decoherence. This strategy increases the extracted amount of information and allows to build new measurements for a set of feasible measurements. Using the tools of cavity quantum eletrodynamics, we have prepared entangled states of microwave photons spread on two separated modes. We have then performed a trajectory tomography of these states, in a large Hilbert space. We have proved that this method allows to estimate the state, to develop faster strategies for extracting information on specific coherences of the state and to compute error bars on the components of the estimated density matrix.
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Submitted on : Wednesday, February 5, 2020 - 12:29:06 PM
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  • HAL Id : tel-02467898, version 1

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Valentin Métillon. Tomographie par trajectoires d'états délocalisés du champ micro-onde de deux cavités. Physique Quantique [quant-ph]. École normale supérieure, 2019. Français. ⟨tel-02467898⟩

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