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High-contrast readout of superconducting qubits beyond the single-shot resolution limit
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10.1063/1.2818693
/content/aip/journal/apl/91/23/10.1063/1.2818693
http://aip.metastore.ingenta.com/content/aip/journal/apl/91/23/10.1063/1.2818693
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic of the phase qubit circuit. The qubit junction is embedded in a superconducting loop which is coupled inductively to the flux-biasing coil and readout dc SQUID. (b) Sketch of the qubit potential . On the right side, a zoom into the shallow left potential well indicates the wave functions describing the two qubit states ∣0⟩ and ∣1⟩.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Switching current distributions of a dc SQUID broadened by thermal fluctuations at . Left and right histograms correspond to the qubit being in state and , respectively. The intermediate histogram corresponds to equal probability of the two states. Dashed lines are polynomial fits. (b) The probability to measure the state versus externally applied flux. The dotted curve is calculated using the standard method, resulting in a maximum contrast of 70%. The solid curve has been obtained from weighted fits to the histograms, which reconstruct the two states with 100% contrast.

Image of FIG. 3.
FIG. 3.

(Color online) Rabi oscillation in the excited qubit state, measured at temperatures of (top) and (bottom). Blue data points (fitted by dashed line) are obtained by the standard evaluation method. A loss of oscillation visibility due to thermal histogram broadening is avoided by the weighted fit evaluation, resulting in the red data points (solid line).

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/content/aip/journal/apl/91/23/10.1063/1.2818693
2007-12-04
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-contrast readout of superconducting qubits beyond the single-shot resolution limit
http://aip.metastore.ingenta.com/content/aip/journal/apl/91/23/10.1063/1.2818693
10.1063/1.2818693
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