Michael Marthaler

Karlsruhe, Baden-Württemberg, Deutschland Kontaktinformationen
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Experienced scientist and team leader in the field of quantum technologies. Participated…

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Berufserfahrung und Ausbildung

  • HQS Quantum Simulations

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Bescheinigungen und Zertifikate

  • Entrepreneurship for Researchers

    HECTOR School of Engineering & Management

Veröffentlichungen

  • Distortion of a reduced equilibrium density matrix: influence on quantum emulation

    Phys. Rev. B 93, 014305 (2016)

    We study a system coupled to external degrees of freedom, called bath, where we assume that the total system consisting of system and bath is in equilibrium. An expansion in the coupling between system and bath leads to a general form of the reduced density matrix of the system as a function of the bath self energy. The coupling to the bath results in a renormalization of the energies of the system and in a change of the eigenbasis. This theory is applicable to quantum emulators in thermal…

    We study a system coupled to external degrees of freedom, called bath, where we assume that the total system consisting of system and bath is in equilibrium. An expansion in the coupling between system and bath leads to a general form of the reduced density matrix of the system as a function of the bath self energy. The coupling to the bath results in a renormalization of the energies of the system and in a change of the eigenbasis. This theory is applicable to quantum emulators in thermal equilibrium. Undesired external degrees of freedom can affect their reliability. We study the influence of bosonic degrees of freedom on the state of a six qubit system.

    Andere Autor:innen
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  • Google Scholar

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    A full list of all my publications.

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  • Implementation of a quantum metamaterial using superconducting qubits

    Nature Communications 5, 5146 (2014)

    The key issue for the implementation of a metamaterial is to demonstrate the existence of collective modes corresponding to coherent oscillations of the meta-atoms. Atoms of natural materials interact with electromagnetic fields as quantum two-level systems. Artificial quantum two-level systems can be made, for example, using superconducting nonlinear resonators cooled down to their ground state. Here we perform an experiment in which 20 of these quantum meta-atoms, so-called flux qubits, are…

    The key issue for the implementation of a metamaterial is to demonstrate the existence of collective modes corresponding to coherent oscillations of the meta-atoms. Atoms of natural materials interact with electromagnetic fields as quantum two-level systems. Artificial quantum two-level systems can be made, for example, using superconducting nonlinear resonators cooled down to their ground state. Here we perform an experiment in which 20 of these quantum meta-atoms, so-called flux qubits, are embedded into a microwave resonator. We observe the dispersive shift of the resonator frequency imposed by the qubit metamaterial and the collective resonant coupling of eight qubits. The realized prototype represents a mesoscopic limit of naturally occurring spin ensembles and as such we demonstrate the AC-Zeeman shift of a resonant qubit ensemble. The studied system constitutes the implementation of a basic quantum metamaterial in the sense that many artificial atoms are coupled collectively to the quantized mode of a photon field.

    Andere Autor:innen
    • Gregor Oelsner
    • Jan-Michael Reiner
    • Stephan André
    • Gerd Schön
    • Uwe Hübner
    • Hans-Georg Meyer
    • Evgeni Il’ichev
    • Alexey V. Ustinov
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  • Summary

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    More than 60 papers published, including in high impact journals like Nature, Nature Communications, Physical Review X and Physical Review Letters.

Sprachen

  • German

    Muttersprache oder zweisprachig

  • English

    Verhandlungssicher

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