Flux qubits in a planar circuit quantum electrodynamics architecture: quantum control and decoherence

  1. J.-L. Orgiazzi,
  2. C. Deng,
  3. D. Layden,
  4. R. Marchildon,
  5. F. Kitapli,
  6. F. Shen,
  7. M. Bal,
  8. F. R. Ong,
  9. and A. Lupascu
We report experiments on superconducting flux qubits in a circuit quantum electrodynamics (cQED) setup. Two qubits, independently biased and controlled, are coupled to a coplanar waveguide resonator. Dispersive qubit state readout reaches a maximum contrast of 72%. We find intrinsic energy relaxation times at the symmetry point of 7μs and 20μs and levels of flux noise of 2.6μΦ0/Hz‾‾‾√ and 2.7μΦ0/Hz‾‾‾√ at 1 Hz for the two qubits. We discuss the origin of decoherence in the measured devices. These results demonstrate the potential of cQED as a platform for fundamental investigations of decoherence and quantum dynamics of flux qubits.
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