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. 2015 Jul 8;6:7654. doi: 10.1038/ncomms8654

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(a) Hubbard model picture with two sites and four modes, with hopping strength V and on-site interactions U. The creation of one excitation from the groundstate is shown for each mode. (b) Optical micrograph of the device. The scale bar (bottom left) denotes 200 μm. The coloured cross-shaped structures are the used Xmon transmon qubits. The construction of the fermionic operators for four modes is shown on the right. Colours highlight the corresponding sites, qubits and operators.