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Microwave readout scheme for a Josephson phase qubit
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10.1063/1.3533805
/content/aip/journal/apl/97/26/10.1063/1.3533805
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/26/10.1063/1.3533805
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Scheme of the measurement setup. The SQUID with shunt capacitor coupled to the qubit. The pulsed microwave signal is applied via a cryogenic circulator, and the reflected signal is amplified by a cryogenic amplifier.

Image of FIG. 2.
FIG. 2.

Microwave frequency applied to the SQUID vs externally applied flux. The measurement points show the position of a dip in the reflected signal amplitude for two different directions of the flux sweep.

Image of FIG. 3.
FIG. 3.

Shift of the resonance frequency of the SQUID resonator by 30 MHz due to the qubit changing its magnetic flux by approximately . (a) In the linear regime. (b) SQUID driven in the nonlinear regime. Note the larger signal amplitude compared to the linear regime.

Image of FIG. 4.
FIG. 4.

Coherent oscillations of the qubit at different driving powers, from bottom to top: −18, −15, −12, −9, and −6 dBm. Curves are offset by 0.1 for better visibility.

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/content/aip/journal/apl/97/26/10.1063/1.3533805
2010-12-30
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microwave readout scheme for a Josephson phase qubit
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/26/10.1063/1.3533805
10.1063/1.3533805
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