• DOI:10.1038/s41598-021-95482-w
• Corpus ID: 235795301

Multi-qubit correction for quantum annealers

@article{Ayanzadeh2021MultiqubitCF,
  title={Multi-qubit correction for quantum annealers},
  author={Ramin Ayanzadeh and John E. Dorband and Milton Halem and Timothy W. Finin},
  journal={Scientific Reports},
  year={2021},
  volume={11}
}

• Ramin Ayanzadeh, J. Dorband, +1 author Timothy W. Finin
• Published 30 September 2020
• Physics
• Scientific Reports

We present multi-qubit correction (MQC) as a novel postprocessing method for quantum annealers that views the evolution in an open-system as a Gibbs sampler and reduces a set of excited states to a new synthetic state with lower energy value. After sampling from the ground state of a given (Ising) Hamiltonian, MQC compares pairs of excited states to recognize virtual tunnels—i.e., a group of qubits that changing their states simultaneously can result in a new state with lower energy value—and successively converges to the ground state. Experimental results using D-Wave 2000Q quantum annealers demonstrate that MQC finds samples with notably lower energy values and improves the reproducibility of results when compared to recent hardware/software advances in the realm of quantum annealing, such as spin-reversal transforms, classical postprocessing techniques, and increased inter-sample delay between successive measurements.