Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.080502
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Funding
- Netherlands Organisation for Scientific Research (NWO)
- Office of the Director of National Intelligence (ODNI)
- Intelligence Advanced Research Projects Activity (IARPA), through the Army Research Office [W911NF-09-1-0375, W911NF-10-1-0334]
- NSF
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We demonstrate a planar, tunable superconducting qubit with energy relaxation times up to 44 mu s. 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. We elucidate this defect physics by experimentally varying the geometry and by a model analysis. 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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