Measurement-induced qubit state mixing in circuit QED from up-converted dephasing noise.
Phys Rev Lett
; 109(15): 153601, 2012 Oct 12.
Article
em En
| MEDLINE
| ID: mdl-23102305
ABSTRACT
We observe measurement-induced qubit state mixing in a transmon qubit dispersively coupled to a planar readout cavity. Our results indicate that dephasing noise at the qubit-readout detuning frequency is up-converted by readout photons to cause spurious qubit state transitions, thus limiting the nondemolition character of the readout. Furthermore, we use the qubit transition rate as a tool to extract an equivalent flux noise spectral density at f~1 GHz and find agreement with values extrapolated from a 1/f(α) fit to the measured flux noise spectral density below 1 Hz.
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2012
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Article