Browsing by Author "Hakonen, Pertti Juhani"

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    Generation and Structuring of Multipartite Entanglement in a Josephson Parametric System
    (WILEY-VCH VERLAG, 2023-01) Petrovnin, Kirill Viktorovich; Perelshtein, Michael Romanovich; Korkalainen, Tero; Vesterinen, Visa; Lilja, Ilari; Paraoanu, Gheorghe Sorin; Hakonen, Pertti Juhani; Department of Applied Physics; Centre of Excellence in Quantum Technology, QTF; Superconducting Qubits and Circuit QED; Quantum Circuits and Correlations; Department of Applied Physics; VTT Technical Research Centre of Finland
    Quantum correlations are a vital resource in advanced information processing based on quantum phenomena. Remarkably, the vacuum state of a quantum field may act as a key element for the generation of multipartite quantum entanglement. In this work, generation of genuine tripartite entangled state and its control is achieved by the use of the phase difference between two continuous pump tones. Control of the subspaces of the covariance matrix for tripartite bisqueezed state is demonstrated. Furthermore, by optimizing the phase relationships in a three-tone pumping scheme genuine quadripartite entanglement of a generalized H-graph state (H-graph) is explored. This scheme provides a comprehensive control toolbox for the entanglement structure and allows to demonstrate, for first time to the authors' knowledge, genuine quadripartite entanglement of microwave modes. All experimental results are verified with numerical simulations of the nonlinear quantum Langevin equation. It is envisioned that quantum resources facilitated by multi-pump configurations offer enhanced prospects for quantum data processing using parametric microwave cavities.