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Realization of a classical counterpart of a scalable design for adiabatic quantum computation
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Photograph of the sample. (b) Circuit diagram. Two bistable elements ( and ) are coupled to each other by the coupler. The signals from bistable elements are read out by and SQUIDs. The fluxes through the interferometers could be controlled by the currents ( , and ) through the appropriate bias lines ( ; ; ). All junctions are nominally the same: .

Image of FIG. 2.
FIG. 2.

Demonstration of tunable coupling between two bistable elements. (a) The output signal of the left dc-SQUID vs the current applied to the right bias line. The curves correspond to fixed bias current , 526, 528, 530, 532, 534, 536, 538, and 540; 600, 700, and 800; 850, 852, 854, 856, 858, 860, 862, and (from top to bottom) producing dominant magnetic flux in the coupler. The readout dc-SQUID operates in flux-locked-loop mode. (b) Curves from the upper panel for the coupler’s bias line current , 532, and (from top to bottom); the first curve is close to the transition from antiferromagnetic to ferromagnetic coupling. Since the magnetic flux through the coupler weakly depends also on , the gradual crossover from antiferromagnetic to ferromagnetic regime is driven by the right bias line current. The up, up-down, and down arrows denote antiferromagnetic, “zero,” and ferromagnetic couplings, respectively.

Image of FIG. 3.
FIG. 3.

Output signal of the right dc-SQUID vs the current applied to the left bias line. The current trough the coupler are from top to bottom , 528, 526, 524, 522, 520, and 518; 510, 460, 410, 360, and 310; 210, 208, 206, 204, 202, 200, 198, and .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Realization of a classical counterpart of a scalable design for adiabatic quantum computation