Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 10: Focus Session: New Bright Sources of Quantum Microwaves

TT 10.2: Hauptvortrag

Montag, 1. April 2019, 15:30–16:00, H2

Quantum optics with artificial atoms in an open space — •Oleg Astafiev — Royal Holloway University of London, Egham, UK

Superconducting quantum systems in open space allow one to reproduce textbook phenomena of quantum optics on a new basis of fully controllable artificial quantum systems (artificial atoms). Such systems, differently from natural atoms, can be easily coupled to their environment and other circuit elements and therefore new quantum-optical phenomena can be demonstrated with the single quantum systems. Particularly, a regime of strong coupling to an open 1D transmission line, when the atom relaxes with high probability of the photon emission into the line, has been experimentally achieved. With the strong coupling we were able to experimentally realise a series of effects, useful for applications and also interesting from the fundamental point of view, using the artificial atom as a quantum source and a sensor of specific properties of electromagnetic waves. The following phenomena have been demonstrated: a tuneable on-demand single-photon source, an absolute power sensor, a quantum wave mixer, etc. All these effects are difficult to demonstrate with natural atoms.