Coherent Josephson qubit suitable for scalable quantum integrated circuits
We demonstrate a planar, tunable superconducting qubit with energy relaxation times up to 44 μs. 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...
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| Veröffentlicht in: | Physical review letters 2013-08, Vol.111 (8), p.080502-080502, Article 080502 |
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| container_title | Physical review letters |
| container_volume | 111 |
| creator | Barends, R Kelly, J Megrant, A Sank, D Jeffrey, E Chen, Y Yin, Y Chiaro, B Mutus, J Neill, C O'Malley, P Roushan, P Wenner, J White, T C Cleland, A N Martinis, John M |
| description | We demonstrate a planar, tunable superconducting qubit with energy relaxation times up to 44 μs. 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. |
| doi_str_mv | 10.1103/PhysRevLett.111.080502 |
| format | Article |
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| title | Coherent Josephson qubit suitable for scalable quantum integrated circuits |
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