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Circuit quantum electrodynamics in the ultrastrong-coupling regime
The Jaynes–Cummings model describes the interaction between a two-level system and a small number of photons. It is now shown that the model breaks down in the regime of ultrastrong coupling betweenExpand
Tunable coupling engineering between superconducting resonators: From sidebands to effective gauge fields
In this work we show that a tunable coupling between microwave resonators can be engineered by means of simple Josephson junctions circuits, such as dc and rf superconducting quantum interferenceExpand
Quantum Simulation of the Ultrastrong Coupling Dynamics in Circuit QED
We propose a method to get experimental access to the physics of the ultrastrong (USC) and deep strong (DSC) coupling regimes of light-matter interaction through the quantum simulation of theirExpand
Squeezing with a flux-driven Josephson parametric amplifier
Josephson parametric amplifiers (JPA) are promising devices for applications in circuit quantum electrodynamics and for studies on propagating quantum microwaves because of their good noiseExpand
Path entanglement of continuous-variable quantum microwaves.
Path entanglement constitutes an essential resource in quantum information and communication protocols. Here, we demonstrate frequency-degenerate entanglement between continuous-variable quantumExpand
Dual-path state reconstruction scheme for propagating quantum microwaves and detector noise tomography.
A theory is introduced which, even in the presence of significant amplifier noise, allows one to use these devices for measuring all quadrature moments of propagating quantum microwaves based on cross correlations from a dual-path amplification setup. Expand
Dephasing of a superconducting flux qubit.
The magnetic field dependence of the characteristic energy relaxation time and echo phase relaxation time near the optimal operating point of a flux qubit and at the optimal point, the relation T(2)(echo) approximately 2T(1). Expand
Quantum Memristors with Superconducting Circuits
A quantum device whose memristive behavior arises from quasiparticle-induced tunneling when supercurrents are cancelled is introduced and suitable methods to quantify memory retention in the system are developed. Expand
Networks of nonlinear superconducting transmission line resonators
We investigate a network of coupled superconducting transmission line resonators, each of them made nonlinear with a capacitively shunted Josephson junction coupling to the odd flux modes of theExpand