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Readout for phase qubits without Josephson junctions

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

Published 9 March 2010

KEYWORDS and PACS
Keywords
PACS
  • 84.40.-x
    Radiowave and microwave technology
  • 85.25.Dq
    Superconducting quantum interference devices (SQUIDs)
  • YEAR: 2010
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PUBLICATION DATA
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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
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
History: Received 9 January 2010; accepted 8 February 2010; published 9 March 2010
Permalink: http://link.aip.org/link/?APPLAB/96/102506/1

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