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Low-crosstalk bifurcation detectors for coupled flux qubits
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic representation of the readout circuit. (b) Optical microscope picture showing the on-chip capacitors and two antennas for external driving. (c) Scanning electron micrograph showing the two SQUID loops. These loops are with a mutual inductance of . Each SQUID covers partially one of the two coupled qubits, with and . The resonator loops have a mutual inductance of . The couplings of the resonator loops to the SQUID and qubit loops are minimized by the symmetry of the design. The maximum critical current of each SQUID is . The experiment is performed at the flux operating point . (d) Shape of the ac readout burst. (e) The histogram shows the statistics of the phase picked up at the reflection of 32 768 individual measurements. The two oscillator states can clearly be distinguished.

Image of FIG. 2.
FIG. 2.

Switching probability for detector 1 and 2 as a function of the driving frequency of the externally applied field. Individual curves differ 4 dB in driving power. The dashed lines indicate the driving frequency and resonance frequency for each detector.

Image of FIG. 3.
FIG. 3.

(a) The probability distribution for the measured IDC. The crosstalk shows as a shift in the center of the histograms: the average switching probability is changed by 0.10% and 0.13% for detector 1 and 2, respectively, if the other detector is operated. (b) The probability distribution for the DSC. The average switching probability differs by 0.07% and 0.08% for detector 1 and 2, respectively, for the two different outcomes of the other detector. (c) The IDC as a function of the phase difference between the two ac-driving-signals. (d) The DSC as a function of . The dashed vertical lines indicate the phase setting with favorable crosstalk for the total IDC and the DSC combined.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Low-crosstalk bifurcation detectors for coupled flux qubits