Heralded state preparation in a superconducting qubit.

@article{Johnson2012HeraldedSP,
  title={Heralded state preparation in a superconducting qubit.},
  author={Juan Emmanuel Johnson and Colleen Macklin and D. H. Slichter and R Patil Vijay and Evan Weingarten and John Clarke and Irfan Siddiqi},
  journal={Physical review letters},
  year={2012},
  volume={109 5},
  pages={
          050506
        }
}
We demonstrate high-fidelity, quantum nondemolition, single-shot readout of a superconducting flux qubit in which the pointer state distributions can be resolved to below one part in 1000. In the weak excitation regime, continuous measurement permits the use of heralding to ensure initialization to a fiducial state, such as the ground state. This procedure boosts readout fidelity to 93.9% by suppressing errors due to spurious thermal population. Furthermore, heralding potentially enables a… CONTINUE READING

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