In the past 20 years, impressive progress has been made both experimentally and
theoretically in superconducting quantum circuits, which provide a platform for manipulating …

Superconducting circuits based on Josephson junctions exhibit macroscopic quantum
coherence and can behave like artificial atoms. Recent technological advances have made …

Recent progress in solid-state quantum information processing has stimulated the search for
amplifiers and frequency converters with quantum-limited performance in the microwave …

We demonstrate a qubit readout scheme that exploits the Jaynes-Cummings nonlinearity of
a superconducting cavity coupled to transmon qubits. We find that, in the strongly driven …

The future development of quantum information using superconducting circuits requires
Josephson qubits with long coherence times combined with a high-fidelity readout …

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

We review the theory, fabrication, and implementation of the Josephson bifurcation amplifier
(JBA). At the core of the JBA is a nonlinear oscillator based on a reactively shunted …

We demonstrate initialization by joint measurement of two transmon qubits in 3D circuit
quantum electrodynamics. Homodyne detection of cavity transmission is enhanced by …

The last two decades have seen tremendous advances in our ability to generate and
manipulate quantum coherence in mesoscopic superconducting circuits. These advances …

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 …