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2010

Improved Superconducting Qubit Readout by Qubit-Induced Nonlinearities

Boissonneault, Maxime, Gambetta, J. M., Blais, Alexandre

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In dispersive readout schemes, qubit-induced nonlinearity typically limits the measurement fidelity by reducing the signal-to-noise ratio (SNR) when the measurement power is increased.

Contrary to seeing the nonlinearity as a problem, here we propose to use it to our advantage in a regime where it can increase the SNR.
We show analytically that such a regime exists if the qubit has a many-level structure.
We also show how this physics can account for the high-fidelity avalanchelike measurement recently reported by Reed {\it et al.} [arXiv:1004.4323v1].

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