Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime

By P. Forn-D'iaz, Juan José García-Ripoll, B. Peropadre, J. Orgiazzi, M. A. Yurtalan, R. Belyansky, Christopher M. Wilson, A. Lupascu. Nature Physics, 2016

466 citations recorded by the source corpus.

A superconducting artificial atom coupled to a 1D waveguide tests the limits of light–matter interaction in an unexplored coupling regime, which may enable new perspectives for quantum technologies. The study of light–matter interaction has led to important advances in quantum optics and enabled numerous technologies. Over recent decades, progress has been made in increasing the strength of this interaction at the single-photon level. More recently, a major achievement has been the demonstration of the so-called strong coupling regime1,2, a key advancement enabling progress in quantum information science. Here, we demonstrate light–matter interaction over an order of magnitude stronger than previously reported, reaching the nonperturbative regime of ultrastrong coupling (USC). We achieve this using a superconducting artificial atom tunably coupled to the electromagnetic continuum of a one-dimensional waveguide. For the largest coupling, the spontaneous emission rate of the atom exceeds its transition frequency. In this USC regime, the description of atom and light as distinct entities breaks down, and a new description in terms of hybrid states is required3,4. Beyond light–matter interaction itself, the tunability of our system makes it a promising tool to study a number of important physical systems, such as the well-known spin-boson5 and Kondo models6.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/02da0333014737b04171f2e70243ce9c954f457e

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Citations in the corpus

Circuit quantum electrodynamics (2020, result): “Similar results have also been obtained in the context of waveguide QED where the qubit is coupled to an open transmission line rather than to a localized cavity mode (Forn-Diaz et al., 2016).”
Quantum Simulation Of The Quantum Rabi Model In A Trapped Ion (2017, background): “In recent years, experimental efforts have been made to reach the DSC regime [16,17], which stimulates the study of exotic physics of the QRM in the USC or DSC regimes.”
Microwave photonics with superconducting quantum circuits (2017, background): “Finally, we note that a recent experiment has demonstrated ultrastrong coupling of a flux qubit to an open onedimensional (1D) transmission line [396].”