Transition from weak to strong measurements by nonlinear quantum feedback control

Details Transition from weak to strong measurements by nonlinear quantum feedback control Transition from weak to strong measurements by nonlinear quantum feedback control

2009-11-26

arxiv.org/abs/0911.5110v3

Phys. Rev. A 82, 022101 (2010)

Physics

Quantum Physics

10 pages, 5 figures

Scientific paper

We find that feedback control may induce "pseudo" nonlinear dynamics in a damped harmonic oscillator, whose centroid trajectory in the phase space behaves like a classical nonlinear system. Thus, similar to nonlinear amplifiers (e.g., rf-driven Josephson junctions), feedback control on the harmonic oscillator can induce nonlinear bifurcation, which can be used to amplify small signals and further to measure quantum states of qubits. Using the circuit QED systems as an example, we show how to apply our method to measure superconducting charge qubits.

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