Implementation of superconductor-ferromagnet-superconductor pi-shifters in superconducting digital and quantum circuits - Condensed Matter > SuperconductivityReport as inadecuate




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Abstract: The difference between the phases of superconducting order parameter plays insuperconducting circuits the role similar to that played by the electrostaticpotential difference required to drive a current in conventional circuits. Thisfundamental property can be altered by inserting in a superconducting circuit aparticular type of weak link, the so-called Josephson $\pi$-junction havinginverted current-phase relation and enabling a shift of the phase by $\pi$. Wedemonstrate the operation of three superconducting circuits - two of them areclassical and one quantum - which all utilize such $\pi$-phase shiftersrealized using superconductor-ferromagnet-superconductor sandwich technology.The classical circuits are based on single-flux-quantum cells, which are shownto be scalable and compatible with conventional niobium-based superconductingelectronics. The quantum circuit is a $\pi$-phase biased qubit, for which weobserve coherent Rabi oscillations and compare the measured coherence time withthat of conventional superconducting phase qubits.



Author: A. K. Feofanov, V. A. Oboznov, V. V. Bol'ginov, J. Lisenfeld, S. Poletto, V. V. Ryazanov, A. N. Rossolenko, M. Khabipov, D.

Source: https://arxiv.org/







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