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Quantum State Sensitivity of an Autoresonant Superconducting Circuit

Murch, KW, Ginossar, E, Weber, SJ, Vijay, R, Girvin, SM and Siddiqi, I (2012) Quantum State Sensitivity of an Autoresonant Superconducting Circuit Physics Review B.

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Abstract

When a frequency chirped excitation is applied to a classical high-Q nonlinear oscillator, its motion becomes dynamically synchronized to the drive and large oscillation amplitude is observed, provided the drive strength exceeds the critical threshold for autoresonance. We demonstrate that when such an oscillator is strongly coupled to a quantized superconducting qubit, both the effective nonlinearity and the threshold become a non-trivial function of the qubit-oscillator detuning. Moreover, the autoresonant threshold is sensitive to the quantum state of the qubit and may be used to realize a high fidelity, latching readout whose speed is not limited by the oscillator Q.

Item Type: Article
Additional Information: Murch, K. W., et al. "Quantum State Sensitivity of an Autoresonant Superconducting Circuit. arXiv preprint arXiv:1208.4646 (2012).
Related URLs:
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Symplectic Elements
Date Deposited: 06 Dec 2012 11:27
Last Modified: 23 Sep 2013 19:43
URI: http://epubs.surrey.ac.uk/id/eprint/729045

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