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Superconducting electrical circuits can be used to study the physics of cavity quantum electrodynamics (QED) in new regimes, therefore realizing circuit QED. For quantum-information processing and… (More)

Systems in the dispersive regime of cavity quantum electrodynamics (QED) are approaching the limits of validity of the dispersive approximation. We present a model which takes into account nonlinear… (More)

- Raechel A. Bianchetti, Stefan Filipp, +6 authors Andreas Wallraff
- Physical review letters
- 2010

A number of superconducting qubits, such as the transmon or the phase qubit, have an energy level structure with small anharmonicity. This allows for convenient access of higher excited states with… (More)

- D. H. Slichter, R Patil Vijay, +5 authors Irfan Siddiqi
- Physical review letters
- 2012

We observe measurement-induced qubit state mixing in a transmon qubit dispersively coupled to a planar readout cavity. Our results indicate that dephasing noise at the qubit-readout detuning… (More)

- Maxime Boissonneault, Jay M. Gambetta, Alexandre Blais
- Physical review letters
- 2010

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… (More)

- Patrice Bertet, Florian R. Ong, +6 authors Daniel Estève
- 2011

One of the most studied model systems in quantum optics is a two-level atom strongly coupled to a single mode of the electromagnetic field stored in a cavity, a research field named cavity quantum… (More)

- Florian R. Ong, Maxime Boissonneault, +5 authors Patrice Bertet
- Physical review letters
- 2013

We measure the quantum fluctuations of a pumped nonlinear resonator using a superconducting artificial atom as an in situ probe. The qubit excitation spectrum gives access to the frequency and amount… (More)

- Florian R. Ong, Maxime Boissonneault, +7 authors Daniel Estève
- Physical review letters
- 2011

We have performed spectroscopic measurements of a superconducting qubit dispersively coupled to a nonlinear resonator driven by a pump microwave field. Measurements of the qubit frequency shift… (More)