Photon transport in a Bose-Hubbard chain of superconducting artificial atoms

  1. G.P. Fedorov,
  2. S. Remizov,
  3. D. Shapiro,
  4. V. Pogosov,
  5. I.A. Rodionov,
  6. O. V. Astafiev,
  7. and A. V. Ustinov
We demonstrate non-equilibrium steady-state photon transport through a chain of five coupled artificial atoms simulating the driven-dissipative Bose-Hubbard model. Using transmission spectroscopy, we show that the system retains many-particle coherence despite being coupled strongly to two open spaces. We show that system energy bands may be visualized with high contrast using cross-Kerr interaction. For vanishing disorder, we observe the transition of the system from the linear to the nonlinear regime of photon blockade in excellent agreement with the input-output theory. Finally, we show how controllable disorder introduced to the system suppresses this non-local photon transmission. We argue that proposed architecture may be applied to analog simulation of many-body Floquet dynamics with even larger arrays of artificial atoms paving an alternative way to demonstration of quantum supremacy (Martin Leib: The topic of this article is a central theme of my entire work and yet the authors managed to ignore everything I have worked on …)
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