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A superconducting flux qubit and circuit imaged by atomic force microscopy. The energy gap of the flux qubit can be tuned using the additional flux loop (white box and large inset) in the circuit. [F. G. Paauw, A. Fedorov, C. J. Harmans, and J. E. Mooij, Phys. Rev. Lett. 102, 090501 (2009)] |


