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Phys Rev Lett. 2014 Sep 19;113(12):123601. Epub 2014 Sep 19.

Flux qubits with long coherence times for hybrid quantum circuits.

Author information

1
Quantronics Group, SPEC, IRAMIS, DSM, CEA Saclay, 91191 Gif-sur-Yvette, France.
2
Forschungszentrum Jülich, Peter Grünberg Institut (PGI-2), 52425 Jülich, Germany.

Abstract

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  μs range and a pure dephasing time comprised between 3 and 10  μs. This significant improvement over previous works opens the way to the coherent coupling of a flux qubit to individual spins.

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