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Updated: Apr 23, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Flux qubits with long coherence times for hybrid quantum circuits
M Stern1, G Catelani2, Y Kubo1
1Quantronics Group, SPEC, IRAMIS, DSM, CEA Saclay, 91191 Gif-sur-Yvette, France.
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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