Improved Superconducting Qubit Readout by Qubit-Induced Nonlinearities

Details Improved Superconducting Qubit Readout by Qubit-Induced Nonlinearities Improved Superconducting Qubit Readout by Qubit-Induced Nonlinearities

2010-04-30

arxiv.org/abs/1005.0004v2

Phys. Rev. Lett. 105, 100504 (2010)

Physics

Quantum Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.105.100504

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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