Implementation of a quantum metamaterial using superconducting qubits.

  title={Implementation of a quantum metamaterial using superconducting qubits.},
  author={Pascal Macha and Gregor Oelsner and Jan-Michael Reiner and Michael Marthaler and Stephan Andr{\'e} and Gerd Sch{\"o}n and Uwe H{\"u}bner and Hans-Georg Meyer and E. Il'ichev and Alexey V. Ustinov},
  journal={Nature communications},
The key issue for the implementation of a metamaterial is to demonstrate the existence of collective modes corresponding to coherent oscillations of the meta-atoms. Atoms of natural materials interact with electromagnetic fields as quantum two-level systems. Artificial quantum two-level systems can be made, for example, using superconducting nonlinear resonators cooled down to their ground state. Here we perform an experiment in which 20 of these quantum meta-atoms, so-called flux qubits, are… 
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