Engineering the Level Structure of a Giant Artificial Atom in Waveguide Quantum Electrodynamics

Abstract

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 a new 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.

12 pages, 8 figures

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Cited by in corpus (65)

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• Tunable Chiral Bound States with Giant Atoms
• On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics
• Mechanism of decoherence-free coupling between giant atoms
• Nonreciprocal and chiral single-photon scattering for giant atoms
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• Giant atoms with time-dependent couplings
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• Topology-Enhanced Nonreciprocal Scattering and Photon Absorption in a Waveguide
• Entanglement preparation and non-reciprocal excitation evolution in giant atoms by controllable dissipation and coupling
• Non-Markovian dynamics with a giant atom coupled to a semi-infinite photonic waveguide
• Spatial Non-Locality Induced Non-Markovian EIT in a Single Giant Atom
• Ultrastrong waveguide QED with giant atoms
• Single photon scattering from a chain of giant atoms coupled to a one-dimensional waveguide
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