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Theory of measurement crosstalk in superconducting phase qubits

We analyze the crosstalk error mechanism in measurement of two capacitively coupled superconducting flux-biased phase qubits. The damped oscillations of the superconducting phase after the measurement of the first qubit may significantly excite the second qubit, leading to its measurement error. The first qubit, which is highly excited after the measurement, is described classically. The second qubit is treated both classically and quantum-mechanically. The results of the analysis are used to find the upper limit for the coupling capacitance (thus limiting the frequency of two-qubit operations) for a given tolerable value of the measurement error probability.

preprint2006arXivOpen access
A. G. KofmanQ. ZhangJ. M. MartinisA. N. Korotkov
cond-mat.mes-hallcond-mat.supr-conquant-ph
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A. G. KofmanQ. ZhangJ. M. MartinisA. N. Korotkov

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