The key issue for the implementation of a metamaterial is to demonstrate the existence of
collective modes corresponding to coherent oscillations of the meta-atoms. Atoms of natural …

We propose a scheme of terahertz laser based on an ensemble of asymmetric quantum dots
dressed by an intense electromagnetic field. THz emission originates from the transitions at …

We demonstrate amplification of a microwave signal by a strongly driven two-level system in
a coplanar waveguide resonator. The effect, similar to the dressed-state lasing known from …

Two basic physical models, a two-level system and a harmonic oscillator, are realized on the
mesoscopic scale as coupled qubit and resonator. The realistic system includes moreover …

A controllable and coherent light-matter interface is an essential element for a scalable
quantum information processor. Strong coupling to an on-chip cavity has been …

We investigate the propagation of microwave photons in a one-dimensional open
waveguide interacting with a number of artificial atoms (qubits). Within the formalism of …

We investigate the ultrastrong tunable coupler for coupling of superconducting resonators.
The obtained coupling constant exceeds 1 GHz, and the wide-range tunability is achieved …

We demonstrate amplification (and attenuation) of a probe signal by a driven two-level
quantum system in the Landau-Zener-Stückelberg-Majorana regime by means of an …

We analyze a system composed of a qubit coupled to the electromagnetic fields in two high
quality quantum oscillators. A particular realization of such a system is the superconducting …

We report parametric amplification of a microwave signal in a Kerr medium formed from
superconducting qubits. Two mutually coupled flux qubits, embedded in the current antinode …