EMP is funded through the Horizon2020 programme of the European Commission.
Selected Publications

Quantum wave mixing and visualisation of coherent and superposed photonic states in a waveguide

A. Yu. Dmitriev, R. Shaikhaidarov, V. N. Antonov, T. Hönigl-Decrinis & O. V. Astafiev

Superconducting quantum systems (artificial atoms) have been recently successfully used to demonstrate on-chip effects of quantum optics with single atoms in the microwave range. In particular, a well-known effect of four wave mixing could reveal a series of features beyond classical physics, when a non-linear medium is scaled down to a single quantum scatterer. Here we demonstrate the phenomenon of quantum wave mixing (QWM) on a single superconducting artificial atom. In the QWM, the spectrum of elastically scattered radiation is a direct map of the interacting superposed and coherent photonic states. Moreover, the artificial atom visualises photon-state statistics, distinguishing coherent, one- and two-photon superposed states with the finite (quantised) number of peaks in the quantum regime. Our results may give a new insight into nonlinear quantum effects in microwave optics with artificial atoms.

Nature Communications 8, (2017) 1352

doi: 10.1038/s41467-017-01471-x