Quantum superposition of charge states on capacitively coupled superconducting islands

C. P. Heij*, D. C. Dixon, C. H. Van der Wal, P. Hadley, J. E. Mooij

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    We investigate the ground state properties of a system containing two superconducting islands coupled capacitively by a wire. The ground state is a macroscopic superposition of charge states, even though the islands cannot exchange charge carriers. The ground state of the system is probed by measuring the switching current of a Bloch transistor containing one of the islands. Calculations based on superpositions of charge states on both islands show good agreement with the experiments. The ability to couple quantum mechanical charge fluctuations in two neighboring devices using a wire is relevant for realizing quantum computation with this kind of circuit.

    Original languageEnglish
    Article number144512
    Pages (from-to)1445121-1445125
    Number of pages5
    JournalPhysical Review B
    Issue number14
    Publication statusPublished - Apr 2003

    ASJC Scopus subject areas

    • Condensed Matter Physics

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