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Applied Physics Letters / Volume 96 / Issue 10 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 96, 102506 (2010); doi:10.1063/1.3354089 (3 pages)

Readout for phase qubits without Josephson junctions

Matthias Steffen, Shwetank Kumar, David DiVincenzo, George Keefe, Mark Ketchen, Mary Beth Rothwell, and Jim Rozen

IBM Watson Research Center, Yorktown Heights, New York 10598, USA

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(Received 9 January 2010; accepted 8 February 2010; published online 9 March 2010)

We present a readout scheme for phase qubits which eliminates the read-out superconducting quantum interference device so that the entire qubit and measurement circuitry only require a single Josephson junction. Our scheme capacitively couples the phase qubit directly to a transmission line and detects its state after the measurement pulse by determining a frequency shift observable in the forward scattering parameter of the readout microwaves. This readout is extendable to multiple phase qubits coupled to a common readout line and can in principle be used for other flux biased qubits having two quasistable readout configurations.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

Josephson effect, S-parameters, SQUIDs, transmission lines

PACS

  • 84.40.-x

    Radiowave and microwave (including millimeter wave) technology

  • 85.25.Dq

    Superconducting quantum interference devices (SQUIDs)

ARTICLE DATA

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http://link.aip.org/link/doi/10.1063/1.3354089

PUBLICATION DATA

ISSN:

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

Publisher:

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

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