Kerr nonlinearities and nonclassical states with superconducting qubits and nanomechanical resonators

Details Kerr nonlinearities and nonclassical states with superconducting qubits and nanomechanical resonators Kerr nonlinearities and nonclassical states with superconducting qubits and nanomechanical resonators

2008-08-05

arxiv.org/abs/0808.0743v3

Phys. Rev. A 79, 063811 (2009)

Physics

Quantum Physics

5 pages, 2 figures, fixed typos

Scientific paper

We propose the use of a superconducting charge qubit capacitively coupled to two resonant nanomechanical resonators to generate Yurke-Stoler states, i.e. quantum superpositions of pairs of distinguishable coherent states 180$^\circ$ out of phase with each other. This is achieved by effectively implementing Kerr nonlinearities induced through application of a strong external driving field in one of the resonators. A simple study of the effect of dissipation on our scheme is also presented, and lower bounds of fidelity and purity of the generated state are calculated. Our procedure to implement a Kerr nonlinearity in this system may be used for high precision measurements in nanomechanical resonators.

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