T. Niemczyk

TL;DR: In this article, it was shown that the Jaynes-cummings model breaks down in the regime of ultrastrong coupling between light and matter, and that higher-order processes are possible.

TL;DR: 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.

TL;DR: This work first studies vacuum fluctuations as a function of frequency in a Planck spectroscopy experiment and then measures the covariance matrix of weak thermal states to provide direct experimental evidence that vacuum fluctuations represent the fundamental minimum quantum noise added by a beam splitter to any given input signal.

TL;DR: In this article, the authors present spectroscopic measurements demonstrating the controllability of the qubit gap between zero and more than 10 GHz, and demonstrate the biasing of gradiometric flux qubits near the symmetry point by trapping an odd number of flux quanta.

TL;DR: In this article, the authors present spectroscopic measurements demonstrating a well-defined controllability of the qubit gap between zero and more than 10 GHz, and demonstrate the biasing of gradiometric flux qubits near the symmetry point by trapping an odd number of flux quanta in the gradiometer loop.