%0 Journal Article %T Flux Qubits with Long Coherence Times for Hybrid Quantum Circuits %+ Quantronics Group (QUANTRONICS) %+ Peter Grünberg Institut %A Stern, M. %A Catelani, G. %A Kubo, Y. %A Grezes, C. %A Bienfait, A. %A Vion, Denis %A Esteve, Daniel %A Bertet, Patrice %Z This work was supported by the ANR CHIST-ERA project QINVC, the C'Nano IdF project QUANTROCRYO, the ERC project CIRQUSS, the JSPS, and by the EU under REA Grant Agreement No. CIG-618258 (G. C.). %< avec comité de lecture %@ 0031-9007 %J Physical Review Letters %I American Physical Society %V 113 %N 12 %P 123601 %8 2014 %D 2014 %Z 1403.3871 %R 10.1103/PhysRevLett.113.123601 %K PERSISTENT-CURRENT QUBIT %K DECOHERENCE %K STATE %Z Physics [physics]Journal articles %X We present measurements of superconducting flux qubits embedded in a three dimensional copper cavity. The qubits are fabricated on a sapphire substrate and are measured by coupling them inductively to an on-chip superconducting resonator located in the middle of the cavity. At their flux-insensitive point, all measured qubits reach an intrinsic energy relaxation time in the 6-20 microseconds range and a pure dephasing time comprised between 3 and 10 microseconds. This significant improvement over previous works opens the way to the coherent coupling of a flux-qubit to individual spins. %G English %2 https://cea.hal.science/cea-01384637/document %2 https://cea.hal.science/cea-01384637/file/1403.3871v2.pdf %L cea-01384637 %U https://cea.hal.science/cea-01384637 %~ CEA %~ CNRS %~ OPENAIRE %~ IRAMIS-SPEC %~ ANR %~ IRAMIS %~ GS-PHYSIQUE