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Applied Physics Letters / Volume 97 / Issue 22 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 97, 222508 (2010); http://dx.doi.org/10.1063/1.3522650 (3 pages)

A superconducting 180° hybrid ring coupler for circuit quantum electrodynamics

E. Hoffmann1,2, F. Deppe1,2, T. Niemczyk1,2, T. Wirth3, E. P. Menzel1,2, G. Wild1,2, H. Huebl1,2, M. Mariantoni1,2, T. Weißl1,2, A. Lukashenko3, A. P. Zhuravel4, A. V. Ustinov3, A. Marx1, and R. Gross1,2

1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
2Physik-Department, Technische Universität München, 85748 Garching, Germany
3Karlsruher Institut für Technologie (KIT), Physikalisches Institut, 76128 Karlsruhe, Germany
4B. I. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 61103 Kharkov, Ukraine

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(Received 10 June 2010; accepted 9 November 2010; published online 3 December 2010)

Superconducting circuit quantum electrodynamics experiments with propagating microwaves require devices acting as beam splitters. Using niobium thin films on silicon and sapphire substrates, we fabricated superconducting 180° microstrip hybrid ring couplers, acting as beam splitters with center frequencies of about 6 GHz. For the magnitude of the coupling and isolation, we find −3.5±0.5 dB and at least −15 dB, respectively, in a bandwidth of 2 GHz. We also investigate the effect of reflections at the superconductor-normal conductor contact by means of low temperature laser scanning microscopy. Our measurements show that our hybrid rings are well suited for on-chip applications in circuit quantum electrodynamics experiments.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

microstrip couplers, microstrip lines, microwave photonics, niobium, optical microscopy, quantum electrodynamics, superconducting microwave devices, superconducting thin films

PACS

  • 85.25.Qc

    Superconducting surface acoustic wave devices and other superconducting devices

  • 84.40.Az

    Waveguides, transmission lines, striplines

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3522650

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    A. Blais, R. -S. Huang, A. Wallraff, S. M. Girvin, and R. J. Schoelkopf, Phys. Rev. A 69, 062320 (2004).

    Y. Makhlin, G. Schön, and A. Shnirman, Rev. Mod. Phys. 73, 357 (2001).

    E. P. Menzel, F. Deppe, M. Mariantoni, M. Á. Araque Caballero, A. Baust, T. Niemczyk, E. Hoffmann, A. Marx, E. Solano, and R. Gross, Phys. Rev. Lett. 105, 100401 (2010).

    M. Mariantoni, E. P. Menzel, F. Deppe, M. Á. Araque Caballero, A. Baust, T. Niemczyk, E. Hoffmann, E. Solano, A. Marx, and R. Gross, Phys. Rev. Lett. 105, 133601 (2010).

    A. P. Zhuravel, S. M. Anlage, and A. V. Ustinov, Appl. Phys. Lett. 88, 212503 (2006)APPLAB000088000021212503000001.

    A. D. O'Connell, M. Ansmann, R. C. Bialczak, M. Hofheinz, N. Katz, E. Lucero, C. McKenney, M. Neeley, H. Wang, E. M. Weig, A. N. Cleland, and J. M. Martinis, Appl. Phys. Lett. 92, 112903 (2008)APPLAB000092000011112903000001.


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