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Flux Qubits with Long Coherence Times for Hybrid Quantum Circuits

M. Stern 1 G. Catelani 2 Y. Kubo 1 C. Grezes 1 A. Bienfait 1 Denis Vion 1 Daniel Esteve 1 Patrice Bertet 1
1 QUANTRONICS - Quantronics Group
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
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 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.
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Submitted on : Thursday, October 20, 2016 - 11:57:46 AM
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M. Stern, G. Catelani, Y. Kubo, C. Grezes, A. Bienfait, et al.. Flux Qubits with Long Coherence Times for Hybrid Quantum Circuits. Physical Review Letters, American Physical Society, 2014, 113 (12), pp.123601. ⟨10.1103/PhysRevLett.113.123601⟩. ⟨cea-01384637⟩

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