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Sökning: WFRF:(KOCKUM I) > Chalmers tekniska högskola

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  • Vadiraj, A. M., et al. (författare)
  • Engineering the level structure of a giant artificial atom in waveguide quantum electrodynamics
  • 2021
  • Ingår i: Physical Review A. - 2469-9934 .- 2469-9926. ; 103:2
  • Tidskriftsartikel (refereegranskat)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 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.
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  • Wen, P. Y., et al. (författare)
  • Large Collective Lamb Shift of Two Distant Superconducting Artificial Atoms
  • 2019
  • Ingår i: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 123:23
  • Tidskriftsartikel (refereegranskat)abstract
    • Virtual photons can mediate interaction between atoms, resulting in an energy shift known as a collective Lamb shift. Observing the collective Lamb shift is challenging, since it can be obscured by radiative decay and direct atom-atom interactions. Here, we place two superconducting qubits in a transmission line terminated by a mirror, which suppresses decay. We measure a collective Lamb shift reaching 0.8% of the qubit transition frequency and twice the transition linewidth. We also show that the qubits can interact via the transmission line even if one of them does not decay into it.
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  • Resultat 1-4 av 4

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