Mlynek JA, Abdufarrukh A. Abdumalikov Jr., Fink JM, Steffen L, Baur M, Lang C, Loo AF van, Wallraff A
摘 要
Nonlinearity and entanglement are two important indications by which physical systems can be identified as non-classical. We study the dynamics of the resonant interaction of up to N=3 two-level systems and a single mode of the electromagnetic field. We focus on a single excitation dynamically shared in this fourpartite system. We observe coherent vacuum Rabi oscillations and their nonlinear square root N speed-up in frequency by tracking the populations of all three qubits and the resonator. We use full quantum state tomography to verify that the dynamics generates a maximally entangled 3-qubit W-state when the cavity returns to the vacuum state.
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