Engineering the level structure of a giant artificial atom in waveguide quantum electrodynamics
Artikel i vetenskaplig tidskrift, 2021

Engineering light-matter interactions at the quantum level has been central to the pursuit of quantum optics for decades. Traditionally, this has been done by coupling emitters, typically natural atoms and ions, to quantized electromagnetic fields in optical and microwave cavities. In these systems, the emitter is approximated as an idealized dipole, as its physical size is orders of magnitude smaller than the wavelength of light. Recently, artificial atoms made from superconducting circuits have enabled new frontiers in light-matter coupling, including the study of "giant" atoms which cannot be approximated as simple dipoles. Here, we explore an implementation of a giant artificial atom, formed from a transmon qubit coupled to propagating microwaves at multiple points along an open transmission line. The nature of this coupling allows the qubit radiation field to interfere with itself, leading to some striking giant-atom effects. For instance, we observe strong frequency-dependent couplings of the qubit energy levels to the electromagnetic modes of the transmission line. Combined with the ability to in situ tune the qubit energy levels, we show that we can modify the relative coupling rates of multiple qubit transitions by more than an order of magnitude. By doing so, we engineer a metastable excited state, allowing us to operate the giant transmon as an effective lambda system where we clearly demonstrate electromagnetically induced transparency.

Författare

A. M. Vadiraj

University of Waterloo

Andreas Josefsson Ask

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

T. G. McConkey

University of Waterloo

I Nsanzineza

University of Waterloo

C. W. Sandbo Chang

University of Waterloo

Anton Frisk Kockum

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

C. M. Wilson

University of Waterloo

PHYSICAL REVIEW A

2469-9926 (ISSN) 2469-9934 (eISSN)

Vol. 103 2 023710

Stora atomer - en ny regim för kvantoptik

Vetenskapsrådet (VR), 2020-01-01 -- 2023-12-31.

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1103/PhysRevA.103.023710

Mer information

Senast uppdaterat

2021-03-18