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      Coherent Josephson qubit suitable for scalable quantum integrated circuits

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          Abstract

          We demonstrate a planar, tunable superconducting qubit with energy relaxation times up to 44 microseconds. This is achieved by using a geometry designed to both minimize radiative loss and reduce coupling to materials-related defects. At these levels of coherence, we find a fine structure in the qubit energy lifetime as a function of frequency, indicating the presence of a sparse population of incoherent, weakly coupled two-level defects. This is supported by a model analysis as well as experimental variations in the geometry. Our `Xmon' qubit combines facile fabrication, straightforward connectivity, fast control, and long coherence, opening a viable route to constructing a chip-based quantum computer.

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          Author and article information

          Journal
          08 April 2013
          Article
          10.1103/PhysRevLett.111.080502
          1304.2322
          5c8e6d66-e9bb-4727-bd39-2c17d6a87fd6

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          Phys. Rev. Lett. 111, 080502 (2013)
          10 pages, 9 figures, including supplementary material
          quant-ph cond-mat.mes-hall cond-mat.supr-con

          Condensed matter,Quantum physics & Field theory,Nanophysics
          Condensed matter, Quantum physics & Field theory, Nanophysics

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