The Fermi problem with artificial atoms in circuit QED

Details The Fermi problem with artificial atoms in circuit QED The Fermi problem with artificial atoms in circuit QED

2011-03-21

arxiv.org/abs/1103.4129v2

Phys. Rev. Lett 107, 150402 (2011)

Physics

Quantum Physics

4 pages, 2 figures; typos corrected, introduction revised and experimental discussion extended, results unchanged

Scientific paper

10.1103/PhysRevLett.107.150402

We propose a feasible experimental test of a 1-D version of the Fermi problem using superconducting qubits. We give an explicit non-perturbative proof of strict causality in this model, showing that the probability of excitation of a two-level artificial atom with a dipolar coupling to a quantum field is completely independent of the other qubit until signals from it may arrive. We explain why this is in perfect agreement with the existence of nonlocal correlations and previous results which were used to claim apparent causality problems for Fermi's two-atom system.

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