IDEAS home Printed from https://ideas.repec.org/h/spr/sprchp/978-1-4615-1245-5_4.html
   My bibliography  Save this book chapter

Macroscopic Quantum Superposition in a Three-Josephson-Junction Loop

In: Macroscopic Quantum Coherence and Quantum Computing

Author

Listed:
  • Caspar H. van der Wal

    (Delft University of Technology, Department of Applied Physics and Delft Institute for Micro Electronics and Submicron Technology (DIMES))

  • A. C. J. ter Haar

    (Delft University of Technology, Department of Applied Physics and Delft Institute for Micro Electronics and Submicron Technology (DIMES))

  • F. K. Wilhelm

    (Delft University of Technology, Department of Applied Physics and Delft Institute for Micro Electronics and Submicron Technology (DIMES))

  • R. N. Schouten

    (Delft University of Technology, Department of Applied Physics and Delft Institute for Micro Electronics and Submicron Technology (DIMES))

  • C. J. P. M. Harmans

    (Delft University of Technology, Department of Applied Physics and Delft Institute for Micro Electronics and Submicron Technology (DIMES))

  • T. P. Orlando

    (MIT, Department of Electrical Engineering and Computer Science)

  • Seth Lloyd

    (MIT, Department of Mechanical Engineering)

  • J. E. Mooij

    (Delft University of Technology, Department of Applied Physics and Delft Institute for Micro Electronics and Submicron Technology (DIMES)
    MIT, Department of Electrical Engineering and Computer Science)

Abstract

We present microwave-spectroscopy experiments on two quantum levels of a superconducting loop with three Josephson junctions. The level separation between the ground state and first excited state shows an anti-crossing where two classical persistent-current states with opposite polarity are degenerate. This is evidence for symmetric and antisymmetric quantum superpositions of two macroscopic states; the classical states have persistent currents of 0.5 µA and correspond to the center-of-mass motion of millions of Cooper pairs. A study of the thermal occupancies of the two quantum levels shows that the loop is at low temperatures in a non-equilibrium state.

Suggested Citation

  • Caspar H. van der Wal & A. C. J. ter Haar & F. K. Wilhelm & R. N. Schouten & C. J. P. M. Harmans & T. P. Orlando & Seth Lloyd & J. E. Mooij, 2001. "Macroscopic Quantum Superposition in a Three-Josephson-Junction Loop," Springer Books, in: Dmitri V. Averin & Berardo Ruggiero & Paolo Silvestrini (ed.), Macroscopic Quantum Coherence and Quantum Computing, pages 25-34, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4615-1245-5_4
    DOI: 10.1007/978-1-4615-1245-5_4
    as

    Download full text from publisher

    To our knowledge, this item is not available for download. To find whether it is available, there are three options:
    1. Check below whether another version of this item is available online.
    2. Check on the provider's web page whether it is in fact available.
    3. Perform a
    for a similarly titled item that would be available.

    More about this item

    Keywords

    ;
    ;
    ;
    ;

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:spr:sprchp:978-1-4615-1245-5_4. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Sonal Shukla or Springer Nature Abstracting and Indexing (email available below). General contact details of provider: http://www.springer.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.