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

Photonic crystals are a powerful tool for the manipulation of optical dispersion and density of
states, and have thus been used in applications from photon generation to quantum sensing …

Qubits strongly coupled to a photonic crystal give rise to qubit-photon dressed bound states.
These bound states, comprising the qubits and spatially localized photonic modes induced …

We study two-level systems (2LS) coupled at different points to a one-dimensional
waveguide in which one end is open and the other is either open (infinite waveguide) or …

We study microwave response of a Josephson parametric oscillator consisting of a
superconducting transmission-line resonator with an embedded DC-superconducting …

We show how to generate Bell states and N-partite W states of long-distance
superconducting (SC) qubits in a SC waveguide QED system, where SC qubits are coupled …

Amplification of optical or microwave fields is often achieved by strongly driving a medium to
induce population inversion such that a weak probe can be amplified through stimulated …

Giant atoms are known for the frequency-dependent spontaneous emission and associated
interference effects. In this paper, we study the spontaneous emission dynamics of a two …

We report on the investigation of a superconducting anharmonic multilevel circuit that is
coupled to a harmonic readout resonator. We observe multiphoton transitions via virtual …

We use a three-level artificial atom in the ladder configuration as a source of correlated,
single microwave photons of different frequency. The artificial atom, a transmon-type …