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Life after charge noise: recent results with transmon qubits
A. A. Houck, Jens Koch, M. H. Devoret +2
We review the main theoretical and experimental results for the transmon, a superconducting charge qubit derived from the Cooper pair box. The increased ratio of the Josephson to c…
Nonlinear response of the vacuum Rabi resonance
Lev S. Bishop, J. M. Chow, Jens Koch +5
On the level of single atoms and photons, the coupling between atoms and the electromagnetic field is typically very weak. By employing a cavity to confine the field, the strength…
Analog information processing at the quantum limit with a Josephson ring modulator
N. Bergeal, R. Vijay, V. E. Manucharyan +4
Amplifiers are crucial in every experiment carrying out a very sensitive measurement. However, they always degrade the information by adding noise. Quantum mechanics puts a limit o…
Controlling the spontaneous emission of a superconducting transmon qubit
A. A. Houck, J. A. Schreier, B. R. Johnson +8
We present a detailed characterization of coherence in seven transmon qubits in a circuit QED architecture. We find that spontaneous emission rates are strongly influenced by far o…