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27 April 2024

» arxiv » 1601.7899

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Coherent dynamics and decoherence in a superconducting weak link
J. T. Peltonen ; Z. H. Peng ; Yu. P. Korneeva ; B. M. Voronov ; A. A. Korneev ; A. V. Semenov ; G. N. Gol'tsman ; J. S. Tsai ; O. V. Astafiev ;
Date:	28 Jan 2016
Abstract:	We demonstrate coherent dynamics of quantized magnetic fluxes in a superconducting loop with a weak link - a nanobridge patterned from the same thin NbN film as the loop. The bridge is a short rounded shape constriction, close to 10 nm long and 20 - 30 nm wide, having minimal width at its center. Quantum state control and coherent oscillations in the driven time evolution of the tunnel-junctionless system are achieved. Decoherence and energy relaxation in the system are studied using a combination of microwave spectroscopy and direct time-domain techniques. The effective flux noise behavior suggests inductance fluctuations as a possible cause of the decoherence.
Source:	arXiv, 1601.7899
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