During the last ten years, superconducting circuits have passed from being interesting
physical devices to becoming contenders for near-future useful and scalable quantum …

Coherent control of quantum states has been demonstrated in a variety of superconducting
devices. In all of these devices, the variables that are manipulated are collective …

The Josephson effect describes the flow of supercurrent in a weak link—such as a tunnel
junction, nanowire or molecule—between two superconductors. It is the basis for a variety of …

An array of superconducting islands placed on a normal metal film offers a tunable
realization of nanopatterned superconductivity. This system enables investigation of the …

We have studied the two-qubit quantum Rabi model in the asymmetric case and its
generalizations with dipole and Heisenberg-type qubit–qubit interactions. The solutions are …

We theoretically study superconducting islands based on semiconductor-nanowire
Josephson junctions and take into account the presence of subgap quasiparticle excitations …

The familiar Rabi model, comprising a two-level system coupled to a quantum harmonic
oscillator, continues to produce rich and surprising physics when the coupling strength …

The generalized two-photon Rabi model is proposed due to the recent interests on the
ultrastrong-coupling regime of the circuit QED. The dipole interaction between the qubits in …

The polaron picture is employed to investigate and elucidate the physics of the two-qubit
quantum Rabi model, which describes two identical qubits coupled to a common harmonic …

We present a microscopic theory for the current through a tunnel Josephson junction
coupled to a nonlinear environment, which consists of an Andreev two-level system coupled …