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Abstract
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.
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Details
1 Laboratory of Artificial Quantum Systems, Moscow Institute of Physics and Technology, Dolgoprudny, Russia; Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Russian Federation
2 Laboratory of Artificial Quantum Systems, Moscow Institute of Physics and Technology, Dolgoprudny, Russia; Department of Physics, Royal Holloway, University of London, Surrey, UK
3 Department of Physics, Royal Holloway, University of London, Surrey, UK; National Physical Laboratory, Teddington, UK
4 Laboratory of Artificial Quantum Systems, Moscow Institute of Physics and Technology, Dolgoprudny, Russia; Department of Physics, Royal Holloway, University of London, Surrey, UK; National Physical Laboratory, Teddington, UK