Dynamic quantum Kerr effect in circuit quantum electrodynamics

Details Dynamic quantum Kerr effect in circuit quantum electrodynamics Dynamic quantum Kerr effect in circuit quantum electrodynamics

2011-12-12

arxiv.org/abs/1112.2458v1

Physics

Condensed Matter

Superconductivity

7 pages, 4 figures

Scientific paper

A superconducting qubit coupled to a microwave resonator provides a controllable system that enables fundamental studies of light-matter interactions. In the dispersive regime, photons in the resonator exhibit induced frequency and phase shifts which are revealed in the resonator transmission spectrum measured with fixed qubit-resonator detuning. In this static detuning scheme, the phase shift is measured in the far-detuned, linear dispersion regime to avoid measurement-induced demolition of the qubit quantum state. Here we explore the qubit-resonator dispersive interaction over a much broader range of detunings, by using a dynamic procedure where the qubit transition is driven adiabatically. We use resonator Wigner tomography to monitor the interaction, revealing exotic non-linear effects on different photon states, e.g., Fock states, coherent states, and Schrodinger cat states, thereby demonstrating a quantum Kerr effect in the dynamic framework.

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