Designing frequency-dependent relaxation rates and Lamb shifts for a giant artificial atom

By Anton Frisk Kockum, Per Delsing, G. Johansson. 2014

207 citations recorded by the source corpus.

In traditional quantum optics, where the interaction between atoms and light at optical frequencies is studied, the atoms can be approximated as pointlike when compared to the wavelength of light. So far, this relation has also been true for artificial atoms made out of superconducting circuits or quantum dots, interacting with microwave radiation. However, recent and ongoing experiments using surface acoustic waves show that a single artificial atom can be coupled to a bosonic field at several points wavelengths apart. Here, we theoretically study this type of system. We find that the multiple coupling points give rise to a frequency dependence in the coupling strength between the atom and its environment and also in the Lamb shift of the atom. The frequency dependence is given by the discrete Fourier transform of the coupling-point coordinates and can therefore be designed. We discuss a number of possible applications for this phenomenon, including tunable coupling, single-atom lasing, and other effects that can be achieved by designing the relative coupling strengths of different transitions in a multilevel atom.

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

View Paper: https://www.semanticscholar.org/paper/39ad08722601235aaf9430bf3d7349d63f41f94b

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Citations in the corpus

Giant acoustic atom: A single quantum system with a deterministic time delay (2016, methodology): “Due to the interference of all the finger pairs, the total effective relaxation rate of each local IDT is given by [22]”
Oscillating bound states for a giant atom (2019, unknown): “(8) is simplified into Ωτ = 2nπ/N and the dark frequency is Ωn = Ω + 1 2 Nγ cot ( nπ N ) [24].”
On-demand directional microwave photon emission using waveguide quantum electrodynamics (2022, background): “[36] Anton Frisk Kockum, Per Delsing, and Göran Johansson, “Designing frequency-dependent relaxation rates and lamb shifts for a giant artificial atom,” Phys.”
Quantum information processing with superconducting circuits: a review (2016, background): “The low propa gation speed of phonons should enable new dynamic schemes for processing quantum information, and the short wavelength allows regimes of atomic physics to be explored that cannot be reached in photonic systems [242].”
Microwave photonics with superconducting quantum circuits (2017, background): “Most papers on the subject so far are concerned with two-level atoms [167, 211, 257, 272–274, 564, 568, 569, 571, 573, 574, 577, 580, 583, 584, 591–618], but atoms with three levels [78, 257, 282, 575, 578, 605, 619–628] and more [79, 165, 623, 629, 630] have also been studied.”