Degeneracy-Preserving Quantum Nondemolition Measurement of Parity-Type Observables for Cat Qubits.

@article{Cohen2017DegeneracyPreservingQN,
  title={Degeneracy-Preserving Quantum Nondemolition Measurement of Parity-Type Observables for Cat Qubits.},
  author={Joachim Cohen and W Clarke Smith and Michel H. Devoret and Mazyar Mirrahimi},
  journal={Physical review letters},
  year={2017},
  volume={119 6},
  pages={060503}
}
A central requirement for any quantum error correction scheme is the ability to perform quantum nondemolition measurements of an error syndrome, corresponding to a special symmetry property of the encoding scheme. It is in particular important that such a measurement does not introduce extra error mechanisms, not included in the error model of the correction scheme. In this Letter, we ensure such a robustness by designing an interaction with a measurement device that preserves the degeneracy of… CONTINUE READING

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