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Observation of Dicke superradiance for two artificial atoms in a cavity with high decay rate

Author

Listed:
  • J. A. Mlynek

    (ETH Zürich)

  • A. A. Abdumalikov

    (ETH Zürich)

  • C. Eichler

    (ETH Zürich)

  • A. Wallraff

    (ETH Zürich)

Abstract

An individual excited two-level system decays to its ground state in a process known as spontaneous emission. The probability of detecting the emitted photon decreases exponentially with the time passed since its excitation. In 1954, Dicke first considered the more subtle situation in which two emitters decay in close proximity to each other. He argued that the emission dynamics of a single two-level system is altered by the presence of a second one, even if it is in its ground state. Here, we present a close to ideal realization of Dicke’s original two-spin Gedankenexperiment, using a system of two individually controllable superconducting qubits weakly coupled to a fast decaying microwave cavity. The two-emitter case of superradiance is explicitly demonstrated both in time-resolved measurements of the emitted power and by fully reconstructing the density matrix of the emitted field in the photon number basis.

Suggested Citation

  • J. A. Mlynek & A. A. Abdumalikov & C. Eichler & A. Wallraff, 2014. "Observation of Dicke superradiance for two artificial atoms in a cavity with high decay rate," Nature Communications, Nature, vol. 5(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6186
    DOI: 10.1038/ncomms6186
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    Cited by:

    1. Ya. S. Greenberg & O. A. Chuikin, 2022. "Superradiant emission spectra of a two-qubit system in circuit quantum electrodynamics," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 95(9), pages 1-19, September.
    2. Cheng, Shujie & Xu, He-Guang & Liu, Xueying & Xianlong, Gao, 2022. "Quantum criticality driven by the cavity coupling in the Rabi-dimer model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 604(C).

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